Enfolded Gate

Fragility (This artifact may be targeted by spells or abilities that deal damage. If it receives damage equal
to or greater than its mana cost in a single turn, it is destroyed.)
Reversion—{7}{t}: Reset the game to how it was at
the beginning of X turns ago (Enfolded Gate is unaffected by this), where X is the number of
Loop counters on Enfolded Gate. If X = 0, reset
the game to how it was at the beginning of this
turn. Put a Loop counter on Enfolded Gate.