Legendary Artifact Creature — Golem
Whenever Karn blocks or becomes blocked, it gets -4/+4 until end of turn.
: Target noncreature artifact becomes an artifact creature with power and toughness each equal to its mana value until end of turn.
4/4
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→ Infinite colorless mana, Infinite untap of artifact creatures you control
→ Infinite colorless mana, Infinite untap of artifact creatures you control
→ Infinite colorless mana, Infinite untap of artifact creatures you control
→ Infinite colorless mana, Infinite untap of artifact creatures you control
→ Infinite damage, Infinite lifegain triggers
→ Infinite colorless mana, Infinite untap of artifact creatures you control
A noncreature permanent that turns into a creature can attack, and its abilities can be activated, only if its controller has continuously controlled that permanent since the beginning of their most recent turn. It doesn't matter how long the permanent has been a creature.
The blocking ability triggers only once no matter how many blockers are declared.