Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight + Sarcatog + Arcbound Whelp

Prerequisites

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Steps

1. 1Activate Sarcatog by sacrificing Arcbound Whelp.
2. 2When Arcbound Whelp dies, its modular ability and persist ability trigger.
3. 3Resolve the modular trigger, putting Arcbound Whelp's +1/+1 counters on another artifact creature.
4. 4Resolve the persist trigger, returning Arcbound Whelp from your graveyard to the battlefield. It will not have a -1/-1 counter on it due to its modular ability.
5. 5Resolve the Sarcatog ability.
6. 6Repeat.

Effects

• Infinite +1/+1 counters on certain creatures
• Infinite artifact ETB
• Infinite artifact LTB
• Infinite artifact sacrifice triggers
• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite death triggers
• Infinitely large creature until end of turn