Carius, Peculiar Summoner

Partner with Guppy, Sword-Tailed Symfiny(When this creature enters the battlefield, target player may put Guppy into their hand from their library, then shuffle.)
At the beginning of your precombat main phase, create a 3/3 colorless Vehicle artifact creature token named Tank with crew 2
Discard a card: Creatures you control gain
+1/+1 until end of turn