, : Double the amount of each type of unspent mana you have.

Flash (You may cast this spell any time you could cast an instant.)
Flying
When Draining Whelk enters the battlefield, counter target spell. Put X +1/+1 counters on Draining Whelk, where X is that spell's converted mana cost.

Whenever you cast a Spirit or Arcane spell, you may sacrifice Dreamcatcher. If you do, draw a card.

Flying, trample
When Eater of Days enters the battlefield, you skip your next two turns.

Creatures you control get +1/+1 and have flying and indestructible.
At the beginning of your upkeep, sacrifice a creature. If you can't, sacrifice Eldrazi Monument.

Sacrifice this creature: Add to your mana pool.

Enchant permanent
At the beginning of your precombat main phase, add mana equal to enchanted permanent's mana cost. (Mana cost includes color. If a mana symbol has multiple colors, choose one.)

, Sacrifice a creature: Destroy target creature with flying.

This spell can't be countered.
When you cast this spell, take an extra turn after this one.
Flying, protection from colored spells, annihilator 6
When Emrakul, the Aeons Torn is put into a graveyard from anywhere, its owner shuffles their graveyard into their library.

Target player reveals their hand. You choose a nonbasic land card from it. That player discards that card.

You may choose not to untap Endoskeleton during your untap step.
, : Target creature gets +0/+3 for as long as Endoskeleton remains tapped.

Whenever you cast a creature spell, create X 1/1 black Thrull creature tokens, where X is that spell's converted mana cost.
When you control seven or more Thrulls, sacrifice Endrek Sahr, Master Breeder.

, , Sacrifice a creature or enchantment: Counter target spell.

Experiment Kraj has all activated abilities of each other creature with a +1/+1 counter on it.
: Put a +1/+1 counter on target creature.

Echo (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay its echo cost.)
Sacrifice an artifact: Put a +1/+1 counter on target creature.

, Exile Feldon's Cane: Shuffle your graveyard into your library.

Enchant land
Whenever enchanted land is tapped for mana, its controller adds an additional one mana of any color.

Whenever a creature you control attacks, it gets +2/+2 until end of turn.