mtg bilbo card Bilbo, Birthday Celebrant (Showcase Retired Burglar enters or leaves the battlefield Bilbo, Thief in the Night

In practice, this is a Kathril or Akroma piece that makes your Entombs and Buried Alives that much better

If the result of the roll is somehow less than 1 or greater than 20, the original spell or ability doesn't see heads nor tails (you'll have to read the effect carefully then to determine what happens)

It buffs your other assassins, but you also get an alternative win condition

Blink artifacts or enchantments to do the same

Solitude [Best Free White Interaction Spell] Solitude is what keeps people honest when the white player looks tapped out

Hard sell on a 6-mana commander, but you can build-your-own-ETB if you have some spare mana and a few cheap spells in the yard