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Kalonian Hydra

Trample
Kalonian Hydra enters the battlefield with four +1/+1 counters on it.
Whenever Kalonian Hydra attacks, double the number of +1/+1 counters on each creature you control.

Rarity : Mythic
Types : Creature
SubTypes : Hydra
Artist : Chris Rahn
Flavor : Even baloths fear its feeding time.
Cost converted to mana : 5

Rulings

1 July 2013
To double the number of +1/+1 counters on a creature, determine how many +1/+1 counters are on the creature and put that many more on it. Effects that interact with counters (such as the one created by Corpsejack Menace’s ability) may change the number of counters ultimately put on the creature.

Avatar of Woe

If there are ten or more creature cards total in all graveyards, this spell costs {6} less to cast. Fear (This creature can't be blocked except by artifact creatures and/or black creatures.) {T}: Destroy target creature. It can't be regenerated.

Atraxa, Praetors' Voice

Flying, vigilance, deathtouch, lifelink At the beginning of your end step, proliferate. (You choose any number of permanents and/or players with counters on them, then give each another counter of a kind already there.)