Jace, Architect of Thought

+1: Until your next turn, whenever a creature an opponent controls attacks, it gets -1/-0 until end of turn.
−2: Reveal the top three cards of your library. An opponent separates those cards into two piles. Put one pile into your hand and the other on the bottom of your library in any order.
−8: For each player, search that player’s library for a nonland card and exile it, then that player shuffles their library. You may cast those cards without paying their mana costs.

Boneyard Wurm

Boneyard Wurm’s power and toughness are each equal to the number of creature cards in your graveyard.

Fog

Prevent all combat damage that would be dealt this turn.

Rupture Spire

Rupture Spire enters the battlefield tapped.
When Rupture Spire enters the battlefield, sacrifice it unless you pay .
: Add one mana of any color.

Reforge the Soul

Each player discards their hand, then draws seven cards.
Miracle (You may cast this card for its miracle cost when you draw it if it’s the first card you drew this turn.)

Lone Revenant

Hexproof (This creature can’t be the target of spells or abilities your opponents control.)
Whenever Lone Revenant deals combat damage to a player, if you control no other creatures, look at the top four cards of your library. Put one of them into your hand and the rest on the bottom of your library in any order.

Terrifying Presence

Prevent all combat damage that would be dealt by creatures other than target creature this turn.

Call to Serve

Enchant nonblack creature
Enchanted creature gets +1/+2, has flying, and is an Angel in addition to its other types.

Arcane Melee

Instant and sorcery spells cost less to cast.

Somberwald Dryad

Forestwalk (This creature can’t be blocked as long as defending player controls a Forest.)

Scorch the Fields

Destroy target land. Scorch the Fields deals 1 damage to each Human creature.

Helvault

, : Exile target creature you control.
, : Exile target creature you don’t control.
When Helvault is put into a graveyard from the battlefield, return all cards exiled with it to the battlefield under their owners’ control.

Jar of Eyeballs

Whenever a creature you control dies, put two eyeball counters on Jar of Eyeballs.
, , Remove all eyeball counters from Jar of Eyeballs: Look at the top X cards of your library, where X is the number of eyeball counters removed this way. Put one of them into your hand and the rest on the bottom of your library in any order.

Boneyard Wurm

Boneyard Wurm’s power and toughness are each equal to the number of creature cards in your graveyard.

Rally the Peasants

Creatures you control get +2/+0 until end of turn.
Flashback (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Rupture Spire

Rupture Spire enters the battlefield tapped.
When Rupture Spire enters the battlefield, sacrifice it unless you pay .
: Add one mana of any color.

Combust

This spell can’t be countered.
Combust deals 5 damage to target white or blue creature. The damage can’t be prevented.

Circle of Flame

Whenever a creature without flying attacks you or a planeswalker you control, Circle of Flame deals 1 damage to that creature.

Fog

Prevent all combat damage that would be dealt this turn.

Flameblast Dragon

Flying
Whenever Flameblast Dragon attacks, you may pay . If you do, Flameblast Dragon deals X damage to any target.

Rupture Spire

Rupture Spire enters the battlefield tapped.
When Rupture Spire enters the battlefield, sacrifice it unless you pay .
: Add one mana of any color.

Spread the Sickness

Destroy target creature, then proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)