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In fact, this happened just a handful of years back when Smuggler's Copter was released

Getting multiple uses out of a Bojuka Bog, or just getting more Field of the Dead triggers, is very powerful stuff

Whats more, you can use its abilities to make a strong artifact clone

Diabolic Edict Magic Tempest Keep track of your collection value over time

I think that level up is a fun idea for a mechanic that wants to emulate D&D and its leveling systems

If a spell lets you perform an action "as you Cascade", you take this action after you've finished exiling cards with your Cascade ability but before choosing whether to cast an exiled non-land with the required mana cost