
Enchantment
: You may put an artifact card from your hand onto the battlefield. That artifact gains haste. Sacrifice it at the beginning of the next end step.
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→ Infinite damage, Infinite colored mana that can only be spent to activate abilities
You sacrifice the artifact only if you still control it at the beginning of the next end step. If that artifact has left the battlefield, even if it later came back, you don't sacrifice it.