Source transparency: This Digest item is based primarily on reporting from MTG Rocks. TMF summarizes and interprets the news; original reporting remains credited and linked.
Arni, Humble Scribe untaps whenever another nontoken creature enters under your control and can tap to loot. Retraction Helix or Banishing Knack adds a second tap ability, letting Arni return a zero-cost creature such as Memnite to hand after each cast.
On its own, repeating that sequence needs a second untap or mana engine. Panharmonicon or Roaming Throne doubles Arni’s creature-entry trigger, leaving one untap for the bounce ability and another for looting or Relic of Legends. Recasting the creature then repeats the cycle, producing unlimited loots and, with the mana setup, unlimited mana.
An ETB payoff such as Altar of the Brood can turn the loop into a win, while Shrieking Drake provides another repeatable creature. The important current development is not simply that Arni loots, but that a newly revealed uncommon legend supplies the untap engine for several compact Commander combos.
On its own, repeating that sequence needs a second untap or mana engine. Panharmonicon or Roaming Throne doubles Arni’s creature-entry trigger, leaving one untap for the bounce ability and another for looting or Relic of Legends. Recasting the creature then repeats the cycle, producing unlimited loots and, with the mana setup, unlimited mana.
An ETB payoff such as Altar of the Brood can turn the loop into a win, while Shrieking Drake provides another repeatable creature. The important current development is not simply that Arni loots, but that a newly revealed uncommon legend supplies the untap engine for several compact Commander combos.
Original source: New MTG Commander Enables Surprisingly Powerful Combo Options ↗MTG Rocks