Nicol Bolas, God-Pharaoh

Seven starting loyalty is the whole thesis: this is a planeswalker priced and armored to be unkillable rather than protected, because no single attack meaningfully threatens the pool and the plus abilities push it higher while grinding the opponent down. Where most seven-mana bombs win by generating one enormous swing, this one wins by attrition across every resource an opponent has. One activation attacks their draw and hands you free tempo; another empties their hand two cards at a time; a minus fires off enough damage to erase a blocker, a rival planeswalker, or a chunk of an opponent's life total; and the ultimate, three plus-activations away, wipes their nonland board into exile as a formality rather than the payoff. The design does not lean on any one of these being lethal on the spot. The immediate damage is real but bounded, and the ultimate is slow by design; the pressure comes from the sheer number of angles the character attacks from and the depth of loyalty that lets the controller answer whatever the board demands the turn it resolves. That breadth is why Grixis control and combo shells have leaned on it across formats: it forces a difficult choice every turn it survives, and it is exhausting to leave alive, which is exactly the kind of inevitability the color combination has always wanted from a top-end finisher.