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It's an excellent multiplayer mechanic because it allows for creature decks to avoid kingmaking scenarios, or purposefully engage with them in order to play politics or create periods for player interaction

Mirage Mesa I place Mirage Mesa among the Evolving Wilds of the world, sometimes you don't need the land searching ability, and sometimes you care that it's a desert

Silver Shroud Costume equips for three and then equip when it arrives and then gives it shroud for the turn and then it cannot be blocked forever

Apart from mutate cards to trigger that ability, I guess you could use Stuffy Doll and Brash Taunter, or fill your deck with cards that grant abilities to your commander like backgrounds and the legendary familiars (Kediss, Falthis, et al)