Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color.)
As this artifact enters, choose a creature type.
Creatures you control of the chosen type get +2/+2.

, Pay 1 life: Draw a card, then discard a card.

Whenever a Sliver deals damage, its controller gains that much life.

Prevent all damage that sources of the color of your choice would deal this turn.
Flashback—Tap an untapped white creature you control. (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Destroy target land.

: Add .
: Add or . Activate only if you control a Swamp.

Whenever you cast a spell that's one or more colors, you may gain 1 life for each of that spell's colors. Do this only once each turn.
: Add one mana of any color.

Counter target spell. If that spell is countered this way, put it on top of its owner's library instead of into that player's graveyard.

: Add .
, : Proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)

Attacking creatures you control have deathtouch.
Whenever a creature you control deals combat damage to a player, draw a card.

Whenever you cast an instant or sorcery spell, surveil 1.
At the beginning of your end step, each opponent may sacrifice a nontoken creature of their choice. Each opponent who doesn't loses 2 life for each instant and sorcery card in your graveyard.

, Sacrifice this land: Search your library for a basic land card, put it onto the battlefield tapped, then shuffle. Then if you control four or more lands, untap that land.

Activated abilities of creatures you control cost less to activate, where X is Agatha's power. This effect can't reduce the mana in that cost to less than one mana.
: Other creatures you control get +1/+1 and gain trample and haste until end of turn.

All Slivers have "When this permanent enters, destroy target artifact or enchantment."

Enchant creature
Enchanted creature gets +1/+1 and has flying and lifelink.

This creature can't block.
This creature has haste as long as an opponent has 10 or less life.
Landfall — Whenever a land you control enters, you may return this card from your graveyard to the battlefield.

Create a token that's a copy of target creature, except it has haste and "At the beginning of the end step, exile this token."

+1: Return up to one target land card from your graveyard to your hand.
−1: Wrenn and Six deals 1 damage to any target.
−7: You get an emblem with "Instant and sorcery cards in your graveyard have retrace." (You may cast instant and sorcery cards from your graveyard by discarding a land card in addition to paying their other costs.)

You may activate loyalty abilities of Teferi on any player's turn any time you could cast an instant.
+1: Draw a card, then discard a card.
−3: Target creature you don't control phases out. (Treat it and anything attached to it as though they don't exist until its controller's next turn.)
−10: Take two extra turns after this one.

Take an extra turn after this one.