Prime Speaker Zegana
A guild leader built to convert a single oversized creature into a refuel, fusing Simic's two pillars (big bodies and card advantage) into one enters-the-battlefield event. The body arrives sized to your biggest other creature's power, and the card draw keys off that final number, which rewards going tall rather than wide: with a 7/7 already on the table, this enters as an 8/8 (its 1/1 base plus seven counters) and draws eight, while a clutch of 2/2s leaves it a modest 3/3 drawing three. The only way it remains the 1/1 it prints as is to control no other creatures, or only creatures with zero power. A six-mana legend with a 1/1 base would be unplayable on rate, but because both the counters and the draw measure against an external power figure, it does little in a vacuum and disproportionate work the moment there is a real creature to point at. The wrinkle is that the two halves resolve through different channels. The counters come from a replacement effect as it enters, so they never touch the stack: there is no window to respond before the body is sized. The draw, by contrast, is a separate triggered ability, and because it reads power at resolution, killing this in response still pays out via last known information. The only clean answer is interaction before any of it happens, ideally a counterspell. Left alone with a developed board, it banks an existing power lead into a fistful of cards in a single motion, about as cleanly as green-blue has ever turned creatures already in play into a second hand.
