mtg adventure commander deck Time summoning massive Elementals at a discount with splashy battlefield entry effects All We Know About Magic:

Playing a land also won't cause prowess to trigger

The two individual Wildcard Bundles are four rare wildcards for $9.99 and four mythic wildcards for $19.99

Its not quite Eternal Witness since it can only grab permanents, but in Limited thats not much of an issue

To show how efficient this card is for the right deck, the final versions of Miracle Grow, which were dubbed Super Grow, used Mystic Enforcer as a finisher, since by the time you'd get around to casting it you had an all but guaranteed 6/6 flyer for four mana

And this package costs only 3 mana

Every time it hits an opponent, you get a Treasure token and can cast the top card of their library that turn