On one hand, it stops the game from being over really fast, and stops you from minmaxing your deck to What Works Against Courtneys Moltres

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Now, with Space-Time Smackdown out for a while, players have been anticipating its follow-up, which seems to have been leaked
Win condition coherence: Your win cards should line up with your plan A sentence
At its best it can win a game outright, and at its worst it is still a draw and an untap phase
Dungeon Geists probably wont see play mainboard, but there is a strong possibility of it replacing Transmogrifying Wand or Deep Freeze sideboard