The keyword "unblockable" (or its modern templating, "can't be blocked") is one of the most powerful evasive abilities in the game. However, simply slapping "unblockable" on a 1/1 creature isn't going to win you many games. The real question every deck builder asks is:

There are several cards that grant unblockable abilities to creatures. Here are some popular examples:

For immediate, surprise lethality, one-shot spells or utility lands can catch an opponent off-guard. Fandomhttps://mtg.fandom.com