mtg war of the spark cards - 2X Wanderer - the - Near Mint - Unplayed - MAGIC CARD Return target creature card with converted mana cost X from your graveyard to the battlefield War of the Spark Prerelease

This has exploit, which is a may effect

Deathlace and Purelace messed with protection from black and protection from white creatures

Then, when you crack the Memory Jar, your opponent takes a bunch of damage from Megrim from discarding cards, and you simply draw into more tutors, Memory Jars, and fast mana

In formats like Pauper, where all dual lands are tapped lands, they are one of the best land cycles in the format, with a whole deck (Skerd) being built around them

Release the Gremlins : Sorcery, casting cost of X generic, X generic, and one red mana

When you draft Spire Phantasm, you reveal it, and the next time a player drafts a card from that booster pack, you guess the card