Thrummingbird

Flying
Whenever Thrummingbird deals combat damage to a player, proliferate. (You choose any number of permanents and/or players with counters on them, then give each another counter of a kind already there.)

Flying
Whenever this creature deals combat damage to a player, proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)

The Zeta Set

Edge of Eternities Commander

Commander Masters

Flying
Whenever Thrummingbird deals combat damage to a player, proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)

Phyrexia: All Will Be One

Flying
Whenever Thrummingbird deals combat damage to a player, proliferate.

New Capenna Commander

The List

Commander Anthology Volume II

Commander 2016

Modern Masters 2015

Flying\r
Whenever Thrummingbird deals combat damage to a player, proliferate. (You choose any number of permanents and/or players with counters on them, then give each another counter of a kind already there.)