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Tergrid, God of Fright

Subterror Behemoth Stalagmo X EARTH Level 10 [ RockFlipEffect ] ATK 2800 DEF 2100 FLIP: You can discard 1 "Subterror" monster, and if you do, draw 2 cards

Refined decks will try to account for randomness created by the initial shuffling of the deck, as well as the opponent's actions, by using complementary and preferably efficient cards

In the case of the former, its because the best choices vary not only by color identity, but often by specific deck building limitations: Seismic Assault and many other red effects want you to play an extra-high land count, while a black deck with reanimation and Tortured Existence obviously cares about discarding creatures