At the beginning of your upkeep, put a +1/+1 counter on Myr Prototype.
Myr Prototype can't attack or block unless you pay 1 for each +1/+1 counter on it. (This cost is paid as attackers or blockers are declared.)

• Number: 214
• Rarity: U
• Power: 2
• Toughness: 2
• Type: Artifact Creature
• Subtype: Myr
• Mana cost: 5
• Color: Artifact
• Artist: Dave Dorman