Unnerve

(T: Add U.)

Each player discards their hand, then draws cards equal to the greatest number of cards a player discarded this way.

Join forces — Starting with you, each player may pay any amount of mana. Each player draws X cards, where X is the total amount of mana paid this way.

If one or more +1/+1 counters would be put on a creature you control, that many plus one +1/+1 counters are put on it instead.

Flying Anya gets +3/+3 for each opponent whose life total is less than half their starting life total. As long as an opponent's life total is less than half their starting life total, Anya has indestructible.

This land enters tapped. T: Add B, G, or U.

When this creature enters, bolster 2. (Choose a creature with the least toughness among creatures you control and put two +1/+1 counters on it.) Whenever a creature you control with a +1/+1 counter on it attacks, tap target creature defending player controls.

Converge — This creature enters with a +1/+1 counter on it for each color of mana spent to cast it. Remove a +1/+1 counter from this creature: Add one mana of any color. T: Put a +1/+1 counter on this creature.