Guppy, Sword-Tailed Symfiny

Partner with Carius, Peculiar Summoner
(When this creature enters the battlefield, target player may put Carius into their hand from their library, then shuffle.)
{2}, sacrifice an artifact: Guppy gains double strike until end of turn.
When a creature dies on your side of the battlefield, you may draw a card. This trigger activates only once each turn.