commander 2018 booster box Magic the Gathering: Doctor Who Masters of Evil Deck etched showcase legendary uncommon or foil Commander Masters - Collector Booster

The limiting factor is how many targets you have: you have to choose a different, legal target for every card you discard, so you won't be able to discard 40 cards to kill all three opponents unless one of them has a board filled with dozens of Goblins or Bunnies or other valid targets.

Dialga 139 Glameow Colorless 60 Pose (40) Flip a coin, if tails, this attack does nothing

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Paldea Partners Tins

One-ofs rarely end up being worth too much, but this is a low-supply card from an old set that is currently seeing play in a top-tier Modern deck