When you do, ask a person outside the game Does this look balanced? If they say yes, you may tap or untap target creature
Unless an effect allows you to play additional lands that turn, you can play a land card exiled with Hedron Detonator only if you haven't played a land yet that turn
Etali, Primal Storm Etali, Primal Storm is just too slow to cut it as a commander these days
Meyers take on Princess Twilight Sparkle is no exception
Sword of Fire and Ice A Curiosity saboteur effect with a Shock on top, and blue or red shenanigans just bounce off your creatures what's not to love
Mirror Entity and Maskwood Nexus If you don't want to bother with naming specific Creature types, or if there's motivation to grant your Creatures all types, there are a couple Changeling-related options