Omnath, Locus of Creation

When Omnath enters, draw a card.
Landfall — Whenever a land you control enters, you gain 4 life if this is the first time this ability has resolved this turn. If it's the second time, add {R}{G}{W}{U}. If it's the third time, Omnath deals 4 damage to each opponent and each planeswalker you don't control.

Aven Mindcensor

Flash
Flying
If an opponent would search a library, that player searches the top four cards of that library instead.

Exploration

You may play an additional land on each of your turns.

Drannith Magistrate

Your opponents can't cast spells from anywhere other than their hands.

Vexing Shusher

This spell can't be countered.
{R/G}: Target spell can't be countered.