Exerted cards cannot be used again until they are readied
With the ones we see here, they are all commander-sized, meaning they are aimed to be exciting in the commander format, both in and out of the precon
In fact, a few of the more puzzling choices might lead one to think the landbase is a bit sub standard: Contaminated AquiferContaminated Aquifer Evolving WildsEvolving Wilds Idyllic BeachfrontIdyllic Beachfront Sunlit MarshSunlit Marsh Since the basic land typing isn't particularly relevant in this deck, it couldn't have been impossible to at least include a Dismal BackwaterDismal Backwater instead of a Contaminated AquiferContaminated Aquifer, right
Keep in mind, this method is less reliable for foil cards or certain special editions
Thankfully, cards like Crushing Drawbridge, Tuktuk Rubblefort, Anger, and Mass Hysteria accomplish this task with minimal effort
You can activate a regenerate ability at instant speed, which will save the creature from destruction