Science Teacher — Each Saga spell you cast has replicate. The replicate cost is equal to its mana cost. (When you cast that Saga, copy it for each time you paid its replicate cost. Copies of Saga spells become tokens.)
Doctor's companion (You can have two commanders if the other is the Doctor.)

Destroy all artifacts. They can't be regenerated.

Flying (This creature can't be blocked except by creatures with flying or reach.)
: Return target creature card from your graveyard to the battlefield tapped.

, : 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.

Target opponent reveals their hand. You choose a nonlegendary, nonland card from it. That player discards that card.

: Target creature gets -2/-0 until end of turn.

This land enters tapped.
When this land enters, return a land you control to its owner's hand.
: Add .

Whenever this creature or another Kavu you control enters, exile the top card of your library. For as long as that card remains exiled, you may play it if you control a Kavu.
Warp (You may cast this card from your hand for its warp cost. Exile this creature at the beginning of the next end step, then you may cast it from exile on a later turn.)

This creature gets +3/+0 as long as it has three or more oil counters on it.
: Add one mana of any color.
Whenever this creature becomes tapped, exile target card from a graveyard and put an oil counter on this creature.

This creature enters with three +1/+1 counters on it for each spent to cast it.
When this creature enters, choose up to two other target creatures you control. For each spent to cast this creature, put a +1/+1 counter on each of them.

Bloodthirst 3 (If an opponent was dealt damage this turn, this creature enters with three +1/+1 counters on it.)

Whenever a creature enters, if it entered from your graveyard or you cast it from your graveyard, return this card from your graveyard to the battlefield tapped at the beginning of the next end step.

Enchant Swamp
: Until end of turn, enchanted Swamp becomes a 2/2 black Spirit creature with ": This creature gets +1/+1 until end of turn." It's still a land.
When enchanted Swamp is put into a graveyard, you may return this card from your graveyard to your hand.

Return up to two target creature cards from your graveyard to your hand, then discard a card.

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If you would roll one or more dice, instead roll that many dice plus one and ignore the lowest roll.
Whenever you roll one or more dice, put a +1/+1 counter on Wyll.
Choose a Background (You can have a Background as a second commander.)

Haste
Whenever a creature you control attacks, this creature deals 1 damage to the player or planeswalker it's attacking.

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Flash
Enchant artifact or creature
When this Aura enters, tap enchanted permanent.
Enchanted permanent doesn't untap during its controller's untap step and its activated abilities can't be activated.