Plasm Capture

Counter target spell. At the beginning of your next first main phase, add X mana in any combination of colors, where X is that spell's mana value.

Counterspell

Magus of the Candelabra

Seedborn Muse

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

Fyndhorn Elves

Hurricane

Hurricane deals X damage to each creature with flying and each player.

Kiora's Follower

Doppelgang

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

Altered Ego

This spell can't be countered.
You may have Altered Ego enter as a copy of any creature on the battlefield, except it enters with X additional +1/+1 counters on it.

Wilderness Reclamation

At the beginning of your end step, untap all lands you control.

Chamber of Manipulation

Enchant land
Enchanted land has "{T}, Discard a card: Gain control of target creature until end of turn."

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.

Doubling Cube

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

Sunken Field

Enchant land
Enchanted land has "{T}: Counter target spell unless its controller pays {1}."

Llanowar Elves

Elvish Mystic

Momir Vig, Simic Visionary

Whenever you cast a green creature spell, you may search your library for a creature card, reveal it, then shuffle and put that card on top.
Whenever you cast a blue creature spell, reveal the top card of your library. If it's a creature card, put that card into your hand.