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.
Myr Prototype [Mirrodin]
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![Myr Prototype [Mirrodin]](http://invasioncnc.ca/cdn/shop/files/6d929b28-c184-4e77-a40b-ee43b8a37d79.png?v=1748483184&width={width})
