borderless cards mtg Nissa, Who Shakes the World (Borderless) [Bloomburrow Commander] Sarkhan and Nicol Bolas MtG Foundations Rare Scrawling Crawler

This opens up a ton of new options for existing Commander decks built around the mechanic, and will likely create a few new decks, too

Mix in some board wipes that don't bother you because your cards are suspended, and some counter manipulators and extra turn cards that let you throw off everyone else's timing and you're in for some chaotic action

Legality depends on the tournament format -- Double Major can be legal in some formats and banned or restricted in others

With the high starting life total of 40, you can easily pay to refill your hand time and time again

If we only had access to fair and balanced artifacts key would be an OK support tool for the odd deck and not the artifact deck mainstay it seems like it is

If you play aggressive spellslinger decks in Commander, this is your new best friend