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Similarly, if you sacrifice a creature to activate a mana ability while activating Heirloom Epic's ability, that creature won't be on the battlefield when you pay the ability's activation cost, so you won't be able to tap that creature rather than pay one of the mana in the activation cost

Sepulchral Primordial: Please let other people be playing Clones

Stoneforge Mystic : 1/2 creature that lets you tutor for equipment when it comes into play, and activated ability to play equipment from hand

6 Flatline Flatline is a way to completely wipe away any threats your opponents may have on their sides of the field

Contrast this with Merfolk Branchwalker, where both options are good: About 40% of the time its sort of a Silvergill Adept

However, its a significant addition for Legacy, of all things