Ethereal Armor

Enchant creature
Enchanted creature gets +1/+1 for each enchantment you control and has first strike.

Gonti, Lord of Luxury

Deathtouch
When Gonti, Lord of Luxury enters the battlefield, look at the top four cards of target opponent’s library, exile one of them face down, then put the rest on the bottom of that library in a random order. You may cast that card for as long as it remains exiled, and mana of any type can be spent to cast it.

Ob Nixilis of the Black Oath

+2: Each opponent loses 1 life. You gain life equal to the life lost this way.
−2: Create a 5/5 black Demon creature token with flying. You lose 2 life.
−8: You get an emblem with “, Sacrifice a creature: You gain X life and draw X cards, where X is the sacrificed creature’s power.”
Ob Nixilis of the Black Oath can be your commander.

Narfi, Betrayer King

Other snow and Zombie creatures you control get +1/+1.
: Return Narfi, Betrayer King from your graveyard to the battlefield tapped. ( can be paid with one mana from a snow source.)

Zurgo and Ojutai

Flying, haste
Zurgo and Ojutai has hexproof as long as it entered the battlefield this turn.
Whenever one or more Dragons you control deal combat damage to a player or battle, look at the top three cards of your library. Put one of them into your hand and the rest on the bottom of your library in any order. You may return one of those Dragons to its owner’s hand.

Praetor’s Counsel

Return all cards from your graveyard to your hand. Exile Praetor’s Counsel. You have no maximum hand size for the rest of the game.

Kaito, Dancing Shadow

Whenever one or more creatures you control deal combat damage to a player, you may return one of them to its owner’s hand. If you do, you may activate loyalty abilities of Kaito twice this turn rather than only once.
+1: Up to one target creature can’t attack or block until your next turn.
0: Draw a card.
−2: Create a 2/2 colorless Drone artifact creature token with deathtouch and “When this creature leaves the battlefield, each opponent loses 2 life and you gain 2 life.”

Ghostly Prison

Creatures can’t attack you unless their controller pays for each creature they control that’s attacking you.

Archfiend of Depravity

Flying
At the beginning of each opponent’s end step, that player chooses up to two creatures they control, then sacrifices the rest.

Surge Engine

Defender
: Surge Engine loses defender and gains “This creature can’t be blocked.”
: Surge Engine becomes blue and has base power and toughness 5/4. Activate only if Surge Engine doesn’t have defender.
: Draw three cards. Activate only if Surge Engine is blue and only once.

Surge Engine

Defender
: Surge Engine loses defender and gains “This creature can’t be blocked.”
: Surge Engine becomes blue and has base power and toughness 5/4. Activate only if Surge Engine doesn’t have defender.
: Draw three cards. Activate only if Surge Engine is blue and only once.

In the Trenches

Creatures you control get +1/+1.
: Exile target nonland permanent you don’t control until In the Trenches leaves the battlefield. Activate only as a sorcery and only once.

Ravenous Chupacabra

When Ravenous Chupacabra enters the battlefield, destroy target creature an opponent controls.

O-Kagachi, Vengeful Kami

Flying, trample
Whenever O-Kagachi, Vengeful Kami deals combat damage to a player, if that player attacked you during their last turn, exile target nonland permanent that player controls.

Viconia, Disciple of Violence

When this creature specializes, conjure a duplicate of target creature card exiled with this creature into your hand. The duplicate perpetually gets +1/+0 and gains haste and “You may spend mana as though it were mana of any color to cast this spell.”
: Exile target card from a graveyard.

Skanos, Red Dragon Vassal

First strike
Whenever Skanos, Red Dragon Vassal attacks, another target attacking creature gains first strike and gets +X/+0 until end of turn, where X is Skanos’s power.

Viconia, Disciple of Rebirth

When this creature specializes, conjure a duplicate of target creature card exiled with this creature into your hand. The duplicate perpetually gains “You may spend mana as though it were mana of any color to cast this spell.” If it has mana value 3 or less, you may put it onto the battlefield.
: Exile target card from a graveyard.

Elder Brain

Menace
Whenever Elder Brain attacks a player, exile all cards from that player’s hand, then they draw that many cards. You may play lands and cast spells from among the exiled cards for as long as they remain exiled. If you cast a spell this way, you may spend mana as though it were mana of any color to cast it.

Elder Brain

Menace
Whenever Elder Brain attacks a player, exile all cards from that player’s hand, then they draw that many cards. You may play lands and cast spells from among the exiled cards for as long as they remain exiled. If you cast a spell this way, you may spend mana as though it were mana of any color to cast it.

Skanos Dragonheart

Whenever Skanos Dragonheart attacks, it gets +X/+X until end of turn, where X is the greatest power among other Dragons you control and Dragon cards in your graveyard.
Choose a Background (You can have a Background as a second commander.)

Fight Rigging

Hideaway 5 (When this enchantment enters the battlefield, look at the top five cards of your library, exile one face down, then put the rest on the bottom in a random order.)
At the beginning of combat on your turn, put a +1/+1 counter on target creature you control. Then if you control a creature with power 7 or greater, you may play the exiled card without paying its mana cost.

Blasphemous Act

This spell costs less to cast for each creature on the battlefield.
Blasphemous Act deals 13 damage to each creature.

Secret Plans

Face-down creatures you control get +0/+1.
Whenever a permanent you control is turned face up, draw a card.

Ethereal Armor

Enchant creature
Enchanted creature gets +1/+1 for each enchantment you control and has first strike.