Breeches, Brazen Plunderer

Menace
Whenever one or more Pirates you control deal damage to your opponents, exile the top card of each of those opponents’ libraries. You may play those cards this turn, and you may spend mana as though it were mana of any color to cast those spells.
Partner (You can have two commanders if both have partner.)

Trench Behemoth

Return a land you control to its owner’s hand: Untap Trench Behemoth. It gains hexproof until end of turn.
Whenever a land enters the battlefield under your control, target creature an opponent controls attacks during its controller’s next combat phase if able.

Slash the Ranks

Destroy all creatures and planeswalkers except for commanders.

Toggo, Goblin Weaponsmith

Whenever a land enters the battlefield under your control, create a colorless Equipment artifact token named Rock with “Equipped creature has ‘, , Sacrifice Rock: This creature deals 2 damage to any target'” and equip .
Partner (You can have two commanders if both have partner.)

Furnace Celebration

Whenever you sacrifice another permanent, you may pay . If you do, Furnace Celebration deals 2 damage to any target.

Sporemound

Landfall — Whenever a land enters the battlefield under your control, create a 1/1 green Saproling creature token.

Triumphant Reckoning

Return all artifact, enchantment, and planeswalker cards from your graveyard to the battlefield.

Apex Devastator

Cascade, cascade, cascade, cascade (When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom of your library in a random order. Multiple instances of cascade each trigger separately.)

Breeches, Brazen Plunderer

Menace
Whenever one or more Pirates you control deal damage to your opponents, exile the top card of each of those opponents’ libraries. You may play those cards this turn, and you may spend mana as though it were mana of any color to cast those spells.
Partner (You can have two commanders if both have partner.)

Maelstrom Colossus

Cascade (When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom of your library in a random order.)

Toggo, Goblin Weaponsmith

Whenever a land enters the battlefield under your control, create a colorless Equipment artifact token named Rock with “Equipped creature has ‘, , Sacrifice Rock: This creature deals 2 damage to any target'” and equip .
Partner (You can have two commanders if both have partner.)

Triumphant Reckoning

Return all artifact, enchantment, and planeswalker cards from your graveyard to the battlefield.

Noxious Dragon

Flying
When Noxious Dragon dies, you may destroy target creature with converted mana cost 3 or less.

Slash the Ranks

Destroy all creatures and planeswalkers except for commanders.

Preordain

Scry 2, then draw a card. (To scry 2, look at the top two cards of your library, then put any number of them on the bottom of your library and the rest on top in any order.)

Apex Devastator

Cascade, cascade, cascade, cascade (When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom of your library in a random order. Multiple instances of cascade each trigger separately.)

Preordain

Scry 2, then draw a card. (To scry 2, look at the top two cards of your library, then put any number of them on the bottom of your library and the rest on top in any order.)

Built to Last

Target creature gets +2/+2 until end of turn. If it’s an artifact creature, it gains indestructible until end of turn. (Damage and effects that say “destroy” don’t destroy it.)

Torrential Gearhulk

Flash
When Torrential Gearhulk enters the battlefield, you may cast target instant card from your graveyard without paying its mana cost. If that spell would be put into your graveyard this turn, exile it instead.

Fumigate

Destroy all creatures. You gain 1 life for each creature destroyed this way.

Built to Smash

Target attacking creature gets +3/+3 until end of turn. If it’s an artifact creature, it gains trample until end of turn.