As The Mimeoplasm enters the battlefield, you may exile two creature cards from graveyards. If you do, it enters the battlefield as a copy of one of those cards with a number of additional +1/+1 counters on it equal to the power of the other card.

You have no maximum hand size.
: Add .

Flying
Whenever Thrummingbird deals combat damage to a player, proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)

When Thundercloud Shaman enters the battlefield, it deals damage equal to the number of Giants you control to each non-Giant creature.

, , Discard a card: You gain 4 life.
, , Pay 1 life: Create a 0/1 white Goat creature token.
, , Sacrifice a creature: Return target artifact card from your graveyard to your hand.
, , Sacrifice an artifact: Draw a card.

Tranquil Thicket enters the battlefield tapped.
: Add .
Cycling (, Discard this card: Draw a card.)

Delve (Each card you exile from your graveyard while casting this spell pays for .)
Draw three cards.

Each opponent sacrifices an artifact or enchantment.

Flying
Triskelavus enters the battlefield with three +1/+1 counters on it.
, Remove a +1/+1 counter from Triskelavus: Create a 1/1 colorless Triskelavite artifact creature token with flying. It has "Sacrifice this creature: This creature deals 1 damage to any target."

Hexproof (This creature can't be the target of spells or abilities your opponents control.)
: Regenerate Troll Ascetic.

Haste
When Tuktuk the Explorer dies, create Tuktuk the Returned, a legendary 5/5 colorless Goblin Golem artifact creature token.

Outlast (, : Put a +1/+1 counter on this creature. Outlast only as a sorcery.)
Each creature you control with a +1/+1 counter on it has trample.

Flying, haste
Lieutenant — As long as you control your commander, Tyrant's Familiar gets +2/+2 and has "Whenever Tyrant's Familiar attacks, it deals 7 damage to target creature defending player controls."

: Add .
: Add or . Underground River deals 1 damage to you.

Each opponent discards two cards.

: Add .
, , Sacrifice Unstable Obelisk: Destroy target permanent.

As Urza's Incubator enters the battlefield, choose a creature type.
Creature spells of the chosen type cost less to cast.

Flying
Whenever Victory's Herald attacks, attacking creatures gain flying and lifelink until end of turn.

Vivid Crag enters the battlefield tapped with two charge counters on it.
: Add .
, Remove a charge counter from Vivid Crag: Add one mana of any color.

Vivid Meadow enters the battlefield tapped with two charge counters on it.
: Add .
, Remove a charge counter from Vivid Meadow: Add one mana of any color.