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Aggressive token decks like Caesar, Legion's Emperor and Ajani, Nacatl Pariah can use this to double up on their commanders finishing moves

Wizards of the Coast is officially kicking off spoiler season for its next Magic: The Gathering set Edge of Eternities

Spitting Spider [Eighth Edition] Set: Eighth Edition Type: Creature Spider Rarity: Uncommon Cost: ...

But there could be newer planeswalkers printed in the future which aren't legendary, and of those you would be able to have multiple at the same time

Moreover, if Agatha's Soul Cauldron can grant the activated ability of Emry, Lurker of the Loch to Rona, Herald of Invasion, then you can loop two Mox Amber for infinite mana