The first historic spell you cast each turn has convoke. (Your creatures can help cast it. Each creature you tap while casting it pays for or one mana of that creature's color.)
Doctor's companion (You can have two commanders if the other is the Doctor.)

Flash (You may cast this spell any time you could cast an instant.)
When this creature enters, counter target artifact or creature spell.

Whenever you cycle another card, you gain 1 life.
Cycling (, Discard this card: Draw a card.)

Sacrifice this creature: Return target creature you control to its owner's hand.

Flying
When Ezrim enters, investigate twice. (To investigate, create a Clue token. It's an artifact with ", Sacrifice this token: Draw a card.")
, Sacrifice an artifact: Ezrim gains your choice of vigilance, lifelink, or hexproof until end of turn.

When this creature enters, create a Food token. (It's an artifact with ", , Sacrifice this token: You gain 3 life.")
, , Sacrifice a Food: Target player loses 3 life.

Creatures you control get +1/+2 until end of turn. Untap those creatures.
Basic landcycling (, Discard this card: Search your library for a basic land card, reveal it, put it into your hand, then shuffle.)

Trample
Whenever you roll your third die each turn, put a +1/+1 counter on this creature.

Choose one or both —
• Avengers Disassembled deals 3 damage to each creature.
• Destroy target land. Its controller may search their library for a basic land card, put it onto the battlefield tapped, then shuffle.

This creature enters with a +1/+1 counter on it for each color of mana spent to cast it.
, , Remove X +1/+1 counters from this creature: It deals X damage to any target.
: Return this card from your graveyard to your hand.

When this creature enters, return up to two target instant and/or sorcery cards from your graveyard to your hand.

Destroy target permanent.

Destroy target artifact or enchantment. Assemble a Contraption. (Put the top card of your Contraption deck face up onto one of your sprockets.)

Ward—Discard an enchantment, instant, or sorcery card.
Whenever you cast your second spell each turn, each opponent mills two cards. When one or more cards are milled this way, exile target enchantment, instant, or sorcery card with equal or lesser mana value than that spell from an opponent's graveyard. Copy the exiled card. You may cast the copy without paying its mana cost.

Flying
Whenever you cast a noncreature spell, create a 1/1 blue Merfolk creature token.
Whenever Namor attacks a player who has more life than you, other creatures you control attacking that player get +2/+0 until end of turn.

(: Add .)

Cowards can't block Warriors.
: Choose one that hasn't been chosen this turn —
• This creature gets +1/+1 until end of turn.
• Target creature becomes a Coward until end of turn.
• Target Warrior gains trample until end of turn.

Flying
This creature can't be blocked by blue creatures.
: Target creature becomes blue until end of turn.

Flying
At the beginning of your end step, if you gained or lost life this turn, surveil 1. (Look at the top card of your library. You may put it into your graveyard.)

: Add one mana of any color in your commander's color identity.