Unidentified mountain egg

{x}: deal x damage to the target player, creature, or planeswalker.
when damage is dealt to a player, creature, or planeswalker add a permanent strength counter to Unidentified mountain egg.
When Unidentified mountain egg has 10 permanent strength counter on it. exile Unidentified mountain egg remove half the permanent strength counter rounded down, and return to to the battlefield transformed.
Hatchery(can be a commander with any number
of creatures with hatchery)