Twisted Riddlekeeper - Modern Horizons 3 (Uncommon) [MH3-14]

Twisted Riddlekeeper is an Eldrazi Sphinx from Modern Horizons 3 that costs eight mana to cast, but it has an Emerge cost of five generic and one blue, allowing you to sacrifice a creature to reduce its casting cost. When it enters the battlefield, it taps up to two target permanents and places stun counters on them, preventing them from untapping normally. This card fits well in control and ramp strategies, enabling you to disrupt your opponent's board while maintaining pressure in the skies.