Final Showdown I would not play a six mana board wipe that only hits creatures
Coupled with a bit of interaction for graveyards before sideboarding (Harveys winning maindeck contained Nihil Spellbomb, Tormods Crypt, and Grafdiggers Cage), Whir Prison seems like a well-positioned strategy for as long the metagame has its present shape
rule 702.36., Morph)
Thassa, Deep-Dwelling Thassa, Deep-Dwelling is one of a number of redundant blink pieces that gives you a free flicker each turn, running up against similar cards like Conjurer's Closet, Teleportation Circle, and Don & Leo, Problem Solvers
A melded creature's mana value is the sum of its two melded cards
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