The Instant allows you to copy your next Instant or Sorcery which in this case is the Ephiphany, then on your next turn, you cast Galvanic Iteration with Flashback targeting the Epiphany to take another turn
Don't get me wrong, this is a very powerful creature - you can cast it on the cheap if you want to sacrifice nonland permanents, and it can get quite out of hand if left unchecked
Card flow matters
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$1.29 Warping Wail Modern Horizons 3 Commander Decks $1.99 Devourer of Destiny Modern Horizons 3 $2.29 Glaring Fleshraker Modern Horizons 3 $8.49 Forsaken Monument Modern Horizons 3 Commander Decks $0.59 It That Heralds the End Modern Horizons 3 $9.49 Kozilek's Command Modern Horizons 3 $3.49 Spawnbed Protector Modern Horizons 3 Commander Decks $6.99 Conduit of Ruin Battle for Zendikar $6.49 Eldritch Immunity Modern Horizons 3 Commander Decks $1.79 Selective Obliteration Modern Horizons 3 Commander Decks $7.99 All Is Dust Modern Horizons 3 Commander Decks $4.49 Ulamog's Dreadsire Modern Horizons 3 Commander Decks 0 results found
Similar to Unholy Heat, the presence of Fury in the format has pushed out certain creatures, and in Furys case the card has almost entirely pushed out small-weenie decks from the format
