Those permanents don't untap during their controllers' next untap steps
Cloud of Faeries Finale of Revelation Frantic Search Great Whale Krosan Restorer Likeness of the Seeker Nissa, Genesis Mage Nissa, Sage Animist Nissa, Steward of Elements Nissa, Worldwaker Palinchron Peregrine Drake Pip-Boy 3000 Pore Over the Pages Rewind Shriekwood Devourer Snap Teferi, Hero of Dominaria Time Spiral Treachery Unwind Wrath of Leknif (playtest)
Because if you're deft enough, False Cure can give the volatile, thinky MTG Spiderman commander Mister Negative a bit more reliable
I like to think of archetypes in cubes like Venn diagrams
Theres actually an engine where you play Draconic Destiny on your opponents creature
Still, I recommend capping your fleet at three Spacecraft per deck