mtg chancla card relampago (It cant be the target of spells or abilities.) Chancla relampago - Lightning Greaves

Nasty card draw from decks that have the right fodder to sacrifice to draw a ton of cards or mill some stuff in sacrifice matters or mill decks which, as mentioned above, are very strong

Another popular card that is a little more versatile and sees a bit more pay in formats like Commander is Quicksilver Amulet and its younger brother, Thran Temporal Gateway

Open the metal briefcase, and play

If you need a bit more of a push to maximize your convoke triggers, you can play the Invasion of Segovia, which, when it flips to Caetus, Sea Tyrant of Segovia (a very impressive name for a 3/3 creature), it gives all your noncreature spells convoke, letting you bust out some combat tricks when you're normally tapped out

When your commander is sent to the graveyard or exile, it goes there first (so "dies" triggers still fire), and then you may move it to the command zone as a state-based action