So, the Mask is a combo with a lot of cheap creatures that have ETB restrictions, like Phyrexian Dreadnought or Lord of Tresserhorn
This card is going to fuel Fireballs in my Rosheen Meanderer deck, increase Targ Nar, Demon-Fang Gnolls power and toughness exponentially, and pour even more mana into Zacama, Primal Calamitys abilities
Combine it with cards like Life and Limb, Sporoloth Ancient, or anything that lets you play more lands per turn for maximum value
While piloting the Golgari Yawgmoth deck, Ive regularly ruined an opponents board simply by killing off their creatures/shrinking them enough to make attacking unprofitable, and Ive even proliferated an opponents Chalice of the Void from one to two to lock them out of casting a bunch of spells
Theyre both fantasy-based settings with a lot of similar themes and story threads
Cubes built around themes like snow, or loaded with artifact or enchantment creatures, will get a lot of mileage from Embiggen