At the beginning of your upkeep, put a +1/+1 counter on Myr Prototype.
Myr Prototype can't attack or block unless you pay for each +1/+1 counter on it.
At the beginning of your upkeep, put a +1/+1 counter on Myr Prototype.
Myr Prototype can't attack or block unless you pay for each +1/+1 counter on it. (This cost is paid as attackers or blockers are declared.)
--This card has no flavor text --
