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Then you can cast (note "cast" not "play," so no to dropping lands) the top card of your library if it's a common card

Additionally, Psyducks Flustered Leap gives you easy fuel to power up Gyaradoss Splashing Panic attack

If your opponent Normal or Special Summons a monster(s) (except during the Damage Step), or if an opponent's monster targets this card for an attack: You can return this card to the hand, then you can add 1 Level 2 or lower Beast monster from your GY to your hand, except "Melffy Pony"

Then, for WURBG, you can untap all attacking Creatures

It isn't once per turn and it doesn't have any restrictions

This can be highly effective in any Commander game, and all experienced Commander players know how dangerous artifact-themed decks or +1/+1 counter-based decks can be -- and Optimus Prime's deck is both