Kozilek, Butcher of Truth

When you cast this spell, draw four cards.
Annihilator 4 (Whenever this creature attacks, defending player sacrifices four permanents of their choice.)
When Kozilek is put into a graveyard from anywhere, its owner shuffles their graveyard into their library.

Doubling Cube

{3}, {T}: Double the amount of each type of unspent mana you have.

Seedborn Muse

Untap all permanents you control during each other player's untap step.

Kruphix, God of Horizons

Indestructible
As long as your devotion to green and blue is less than seven, Kruphix isn't a creature.
You have no maximum hand size.
If you would lose unspent mana, that mana becomes colorless instead.

Doppelgang

For each of X target permanents, create X tokens that are copies of that permanent.