This spell has flash as long as you control a permanent with flash.
As an additional cost to cast this spell, sacrifice a creature.
Destroy target creature.

Whenever this creature mutates, put a +1/+1 counter on it.

Flash
Enchant creature
Enchanted creature gets -2/-0 and loses all abilities. (Mutating onto the creature won't give it new abilities. It can gain abilities in other ways.)

If was spent to cast this spell, search your library for a card, put that card into your graveyard, then shuffle your library.
Return up to two permanent cards from your graveyard to your hand.

Create a token that's a copy of target permanent. If was spent to cast this spell, instead create a token that's a copy of that permanent, except the token has "When this permanent enters the battlefield, if it's a creature, it fights up to one target creature you don't control."

Destroy target nonland permanent if it's a creature or if was spent to cast this spell.

Each player chooses an artifact, a creature, an enchantment, and a planeswalker from among the nonland permanents they control, then sacrifices the rest. If was spent to cast this spell, you choose the permanents for each player instead.

Mythos of Vadrok deals 5 damage divided as you choose among any number of target creatures and/or planeswalkers. If was spent to cast this spell, until your next turn, those permanents can't attack or block and their activated abilities can't be activated.

[+1]: You gain 2 life. Add , , or . Spend this mana only to cast a noncreature spell.
[−2]: Draw a card, then you may discard a card. When you discard a nonland card this way, Narset of the Ancient Way deals damage equal to that card's converted mana cost to target creature or planeswalker.
[−6]: You get an emblem with "Whenever you cast a noncreature spell, this emblem deals 2 damage to any target."

Mutate (If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it.)
Whenever this creature mutates, return target creature card with converted mana cost 3 or less from your graveyard to the battlefield.

Mutate (If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it.)
Deathtouch, lifelink
Whenever this creature mutates, return any number of target creature cards with total power 10 or less from your graveyard to the battlefield.

Counter target spell.
Cycling (, Discard this card: Draw a card.)

When Nightsquad Commando enters the battlefield, if you attacked this turn, create a 1/1 white Human Soldier creature token.

Companion — Your starting deck contains only cards with odd converted mana costs and land cards. (If this card is your chosen companion, you may put it into your hand from outside the game for any time you could cast a sorcery.)
If a source you control with an odd converted mana cost would deal damage to a permanent or player, it deals double that damage to that permanent or player instead.

This spell costs less to cast if you control a Human creature and a non-Human creature.
Draw two cards.

At the beginning of combat on your turn, exile target red, white, or black creature card from your graveyard. Create a token that's a copy of that card, except it's 1/1. It gains haste until your next turn.

Whenever you draw a card, put a foreshadow counter on Ominous Seas.
Remove eight foreshadow counters from Ominous Seas: Create an 8/8 blue Kraken creature token.
Cycling (, Discard this card: Draw a card.)

Enchant creature
Enchanted creature can't attack or block.

Mutate (If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it.)
, : Look at the top card of your library. If it's a land card, you may put it onto the battlefield. If you don't put the card onto the battlefield, put it into your hand.

Flying
When Patagia Tiger enters the battlefield, target Human you control gets +2/+2 until end of turn.