In some cases you might actually recognize the Magic creature being super-sized, as in the case of Betrayers of Kamigawa's Unchecked Growth. See below how artist Tsutomu Kawade's art of Unchecked Growth was tied to his Champions piece, Dripping-Tongue Zubera.
In the art of Dripping-Tongue Zubera, that zubera is surrounded by trees of the Jukai Forest. In Unchecked Growth, note that the same zubera wears some of those trees on its head. That's a big spirit.