Whenever you cast a spell, proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)

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Devoid (This card has no color.)
Kozilek's Return deals 2 damage to each creature.
Whenever you cast an Eldrazi creature spell with mana value 7 or greater, you may exile this card from your graveyard. If you do, this card deals 5 damage to each creature.

At the beginning of your upkeep, reveal the top card of your library and put that card into your hand. You lose life equal to its mana value.

, Pay 1 life: This creature gets +1/+0 until end of turn. Activate no more than three times each turn.

Choose a nonland card name. Target player reveals their hand and discards all cards with that name.
Flashback—Sacrifice a creature. (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Suspend 2— (Rather than cast this card from your hand, pay and exile it with two time counters on it. At the beginning of your upkeep, remove a time counter. When the last is removed, you may cast it without paying its mana cost.)
Search your library for a card, put that card into your hand, then shuffle.

+1: Draw a card, then put a card from your hand on top of your library.
−1: Exile another target permanent you own, then return it to the battlefield under your control.
−6: Choose left or right. Each player gains control of all nonland permanents other than Aminatou controlled by the next player in the chosen direction.
Aminatou, the Fateshifter can be your commander.

If you would draw a card while you have no cards in hand, draw two cards instead.
If you would gain life while you have 5 or less life, you gain twice that much life instead.
: Add one mana of any color.

Whenever an artifact or enchantment is put into your graveyard from the battlefield, you gain 1 life.

You don't lose unspent green mana as steps and phases end.
Omnath gets +1/+1 for each unspent green mana you have.

Take an extra turn after this one. At the beginning of that turn's end step, you lose the game.

At the beginning of your upkeep, you draw a card and you lose 1 life.

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As this artifact enters, you may have it become a copy of any creature on the battlefield until end of turn, except it has haste.

Whenever this creature deals combat damage to a player or planeswalker, draw a card.
Discard a card: Put a +1/+1 counter on this creature.
Exile three cards from your graveyard: This creature gains flying until end of turn.

When this creature dies, it deals 2 damage to each opponent and you gain 2 life.

, Sacrifice this creature: Destroy target Wall.

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Enchant creature
Enchanted creature gets +2/+2.
When enchanted creature dies, return that card to its owner's hand.

, : This artifact deals 1 damage to any target. That permanent's controller or that player creates a 1/1 green Squirrel creature token.