You can either: Return a spell you dont control back to its owners hand
As it happened, Mono-Blue was still good against decks like Simic Nexus and the myriad Esper decks despite Blast Zone and Teferi seeing play, and the real thing holding the deck back was the rise of Gruul and Izzet Phoenix both incredibly tough matchups and the shift in Mono-Red away from Risk Factor and towards Experimental Frenzy, as the jump-start on Risk Factor telegraphs when you need to have countermagic open, whereas Frenzy is always ready to punish you the moment you tap out for a Tempest Djinn
This is a concept that I've worked on for a while
Get through 60 cards (or 100 if you're playing Commander), and then play Laboratory Maniac to win the game without ever needing to even scratch your opponent's life total
With enough ramp to afford cracking then, and token doubling, you can get an obscene amount of lands
When you smash face to an opposing player, you can put a dork you exiled on the battlefield under your control, which is likely with its flying, and then you can tap it in future turns to keep up, if your first crew was answered