As an additional cost to cast this spell, sacrifice a creature.
Search your library for a creature card with mana value X or less, where X is 2 plus the sacrificed creature's mana value. Put that card onto the battlefield, then shuffle. Exile Eldritch Evolution.

As this artifact enters, choose a creature type.
Creature spells of the chosen type cost less to cast.

When this creature enters, you get (three energy counters).
Pay : This creature gets +X/+X until end of turn, where X is its power.

First strike (This creature deals combat damage before creatures without first strike.)
Lifelink (Damage dealt by this creature also causes you to gain that much life.)
This creature can't be the target of black or red spells your opponents control.

First strike, vigilance
Heroic — Whenever you cast a spell that targets Anax and Cymede, creatures you control get +1/+1 and gain trample until end of turn.

At the beginning of your upkeep, sacrifice this enchantment unless you sacrifice a creature.
If a land is tapped for mana, it produces instead of any other type and amount.

Changeling (This card is every creature type.)
: Until end of turn, creatures you control have base power and toughness X/X and gain all creature types.

Equipped creature gets +2/+0 and has first strike, vigilance, trample, and haste.
Equip

Other Elf creatures you control get +1/+1.
: Add for each Elf you control.

: Add one mana of any color.
: Put a charge counter on this artifact.
At the beginning of your first main phase, remove all charge counters from this artifact. Add one mana of any color for each charge counter removed this way.

Level up (: Put a level counter on this. Level up only as a sorcery.)
LEVEL 2-3
2/4
, : Copy target instant or sorcery spell. You may choose new targets for the copy.
LEVEL 4+
2/5
, : Copy target instant or sorcery spell twice. You may choose new targets for the copies.

Flying, haste
At the beginning of the end step, sacrifice this creature.
Unearth (: Return this card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the next end step or if it would leave the battlefield. Unearth only as a sorcery.)

Whenever Varchild deals combat damage to a player, that player creates that many 1/1 red Survivor creature tokens.
Survivors your opponents control can't block, and they can't attack you or planeswalkers you control.
When Varchild leaves the battlefield, gain control of all Survivors.

This creature can't block.
Whenever this creature deals combat damage, sacrifice a permanent.

At the beginning of each opponent's upkeep, that player chooses draw step, main phase, or combat phase. The player skips each instance of the chosen step or phase this turn.

Target player untaps all basic lands they control.

Whenever a creature you control deals combat damage, put a blaze counter on this enchantment.
Remove five blaze counters from this enchantment: It deals 5 damage to any target.

When Gadwick enters, draw X cards.
Whenever you cast a blue spell, tap target nonland permanent an opponent controls.

: The next time you would draw a card this turn, this enchantment deals 2 damage to any target instead.

At the beginning of each opponent's upkeep, this artifact deals X damage to that player, where X is 3 minus the number of cards in their hand.

Haste (This creature can attack and as soon as it comes under your control.)
Other Goblin creatures you control get +1/+1 and have haste.

Equipped creature gets +2/+0.
Whenever equipped creature deals combat damage to a player, you may cast a creature spell from that player's graveyard this turn, and you may spend mana as though it were mana of any color to cast that spell.
Equip

As this artifact enters, choose artifact, creature, enchantment, instant, or sorcery.
Spells you cast of the chosen type cost less to cast.

When this creature enters, it explores, then it explores again. (Reveal the top card of your library. Put that card into your hand if it's a land. Otherwise, put a +1/+1 counter on this creature, then put the card back or put it into your graveyard. Then repeat this process.)

Flip a coin. If you win the flip, destroy all creatures with power 2 or less. If you lose the flip, destroy all creatures with power 3 or greater.

Until end of turn, creatures you control gain protection from white if you control a Plains, from blue if you control an Island, from black if you control a Swamp, from red if you control a Mountain, and from green if you control a Forest.

When this creature enters, you may search your library for a creature card with toughness 2 or less, reveal it, put it into your hand, then shuffle.

Trample
Whenever this creature deals combat damage to a player, create a token that's a copy of this creature.

If you would create one or more Treasure tokens, instead create those tokens plus an additional Treasure token.

Haste
Whenever a creature an opponent controls dies, put a +1/+1 counter on Yahenni.
Sacrifice another creature: Yahenni gains indestructible until end of turn.

This creature enters tapped.
When this creature enters, target opponent loses 2 life.
Undying (When this creature dies, if it had no +1/+1 counters on it, return it to the battlefield under its owner's control with a +1/+1 counter on it.)

Whenever Krenko attacks, put a +1/+1 counter on it, then create a number of 1/1 red Goblin creature tokens equal to Krenko's power.

: Exchange control of this creature and target creature. (This effect lasts indefinitely.)

Lands you control have ": Add one mana of any color."
: Add one mana of any color.

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

Lifelink
When this creature dies, put it on the bottom of its owner's library.