Whenever an opponent draws a card, you may pay . If you do, draw a card.

Search your library for a card, then shuffle and put that card on top. You lose 2 life.

Search your library for an artifact or enchantment card, reveal it, then shuffle and put that card on top.

Artifact creatures you control have afflict 3. (Whenever a creature with afflict 3 becomes blocked, defending player loses 3 life.)

: Add .
, Sacrifice this land: Return target land card from your graveyard to your hand.

: Add .
, : Choose a color. Add an amount of mana of that color equal to your devotion to that color. (Your devotion to a color is the number of mana symbols of that color in the mana costs of permanents you control.)

: Add .
, : Target creature can't be blocked this turn.

Destroy all lands.

Whenever you tap a nonland permanent for mana, add one mana of any type that permanent produced.
: Look at the top five cards of your library. You may put a non-Human creature card from among them onto the battlefield. Put the rest on the bottom of your library in a random order.

Gaea's Avenger's power and toughness are each equal to 1 plus the number of artifacts your opponents control.

Whenever an opponent casts their first noncreature spell each turn, draw a card unless that player pays , where X is this creature's power.

Target player takes two extra turns after this one.

Target creature gets -3/-0 until end of turn.
Transmute (, Discard this card: Search your library for a card with the same mana value as this card, reveal it, put it into your hand, then shuffle. Transmute only as a sorcery.)

Search your library for a card, then shuffle and put that card on top. You lose 2 life.

Search your library for a card, then shuffle and put that card on top. You lose 2 life.

Improvise (Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for .)
Bottle-Cap Blast deals 5 damage to any target. If excess damage was dealt to a permanent this way, create that many tapped Treasure tokens. (They're artifacts with ", Sacrifice this token: Add one mana of any color.")

If an opponent would mill one or more cards, they mill twice that many cards instead. (To mill a card, a player puts the top card of their library into their graveyard.)

This spell costs less to cast for each card type among cards in your graveyard.
When you cast this spell, you gain control of target opponent during that player's next turn. After that turn, that player takes an extra turn.
Flying, trample, protection from instants

You may spend mana as though it were mana of any color to activate abilities of creatures you control.
Creatures you control with +1/+1 counters on them have all activated abilities of all creature cards exiled with Agatha's Soul Cauldron.
: Exile target card from a graveyard. When a creature card is exiled this way, put a +1/+1 counter on target creature you control.

Artifacts you control have indestructible. (Effects that say "destroy" don't destroy them. Artifact creatures with indestructible can't be destroyed by damage.)