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When figuring the percentages of rares and mythics, remember that Wizards uses a 2:1 ratio for rares and mythics

Delirium Whenever a source you control deals noncombat damage to an opponent, if there are four or more card types among cards in your graveyard, this creature deals that amount of damage to target creature that player controls

Though it is not technically impossible such a card could be printed under the rules, "technically possible" does not mean it should happen

If youre in a multicolor deck or one with a lot of nonbasic lands, go ahead and play an Urborg, Tomb of Yawgmoth to turn all your lands into Swamps to give your Nightmare a boost

This card grants back-to-back upkeeps, though, so you wont be able to do something in your main phase and try to win afterwards