excavate the top card of your Deck, and if it is a "Crystal Beast" monster, either add it to your hand or Special Summon it
Each opponent loses X life, you gain X life, and the topmost creature card in your library perpetually gets +X/+X, where X is the number of counters removed this way
Artifact Board Wipes There are a lot of cards that fit under this umbrella, but these are some of the most mana-efficient options that will destroy all Treasure Tokens that may be plaguing your Commander games board state
Small variations beyond normal card measurement tolerance can immediately reveal counterfeits
Finally, an alternative to Deflecting Swat that isnt Bolt Bend, for one mana (ish)
While a certain Felidar Sovereign can win with 40 life, as a creature, it's much more vulnerable as every deck can answer creatures, so they can answer it, and thus I find the Test of Endurance to be more reliable for the turn or so before you win with it