Exile cards from the top of your library until you exile a nonland card. You may cast that card without paying its mana cost if the spell's mana value is less than the number of Mountains you control. If you don't cast that card this way, put it into your hand.
Flashback (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Until end of turn, target artifact or creature becomes a 4/4 Angel artifact creature and gains flying.
Draw a card.

When Bumi enters, choose up to X, where X is the number of Lesson cards in your graveyard —
• Put three +1/+1 counters on Bumi.
• Target player scries 3.
• Earthbend 3. (Target land you control becomes a 0/0 creature with haste that's still a land. Put three +1/+1 counters on it. When it dies or is exiled, return it to the battlefield tapped.)

: Create a Treasure token. Activate only if a creature died this turn. (It's an artifact with ", Sacrifice this token: Add one mana of any color.")

Put a +1/+1 counter on target creature you control. Untap that creature.

Defender
: Surveil 1. (Look at the top card of your library. You may put it into your graveyard.)

Destroy target creature. Its controller creates a 1/1 white and black Inkling creature token with flying.

Whenever a Beast you control enters, draw a card.

Sacrifice a creature: This creature gains flying until end of turn.

, Sacrifice this land: Search your library for a basic land card, put it onto the battlefield tapped, then shuffle.

Sanar enters prepared. (While it's prepared, you may cast a copy of its spell. Doing so unprepares it.)
: Create a Treasure token. Activate only if you've cast an instant or sorcery spell this turn.

Molten Note deals damage to target creature equal to the amount of mana spent to cast this spell. Untap all creatures you control.
Flashback (You may cast this card from your graveyard for its flashback cost. Then exile it.)

At the beginning of your upkeep, you gain 1 life.

Create a token that's a copy of target creature you control.
Flashback (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
Exhaust — : Put a double strike counter on Mai. (Activate each exhaust ability only once.)

Whenever Hei Bai enters or attacks, you may sacrifice another creature or artifact. If you do, put two +1/+1 counters on Hei Bai.
When Hei Bai leaves the battlefield, put its counters on target creature you control.

Infusion — Look at the top four cards of your library. You may reveal a creature or land card from among them and put it into your hand. If you gained life this turn, you may instead reveal two creature and/or land cards from among them and put them into your hand. Put the rest on the bottom of your library in a random order.

Web-slinging (You may cast this spell for if you also return a tapped creature you control to its owner's hand.)
When Spiders-Man enters, if they were cast using web-slinging, you gain 3 life and create two 2/1 green Spider creature tokens with reach.

When this creature dies, create a 1/1 black and green Insect creature token with flying.

Vigilance
When this creature enters, surveil 2. (Look at the top two cards of your library, then put any number of them into your graveyard and the rest on top of your library in any order.)