Geyadrone Dihada

Corruption counters are the payload here, and every one of Dihada's four lines exists to seed the board with them or cash them in. The +1 is a Grixis-colored drain that also stamps a counter onto a creature or planeswalker; the -3 is a one-turn theft of a creature or planeswalker that untaps the target, hastes it, and (crucially) leaves a counter behind after control reverts; and the -7 flips every marked permanent to your side permanently. That progression is the mechanical spine: the plus ability is a slow poison, the minus-threes are individual thefts that quietly build toward critical mass, and the ultimate is the collection call on everything you have been tagging. The protection clause closes the obvious loophole: nothing you have corrupted can target or damage Dihada herself, so the counters that build toward the ultimate also insulate her from the board she is turning against its owner. This is a planeswalker built entirely around a proprietary counter type that appears on almost nothing else, which means the deck has to supply its own targets and its own patience; the counters already shield her as they accumulate, then the -7 arrives to make them all matter at once. Most theft effects in the game are one-shot returns that hand the borrowed permanent back clean; the wrinkle is that Dihada's borrowing is never fully repaid, and given enough loyalty activations the debt comes due on every marked permanent in a single ability.