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Consider having your 60th card be a land with an activated ability, for example, which gives you something that can act like a spell and a land

Birthing Pod Good enough to spawn an entire archetype named after it, several pod commanders, and 25 different Wish.com versions, Birthing Pod spawned, er, birthed a whole subset of decks focused on working up a chain of creatures

Magnamon then left on his own, with Guardromon taking the Agent to the mines afterwards

You can see why this is on my Top Ten list, but just outside in my Honorable Mention section

Yes, the effect reads you may play," so you can choose not to play it