In the case of Sefris, its a three step process of self-mill, venturing into dungeon rooms, and finally returning a big Creature back from your Graveyard
These effects are purely cosmetic and dont do anything in battle
At the same time, printing on a fake card will look chaotic and messy
Plus, every Unova creature got an Illustration Rare or Special Illustration Rare between the two sets, which got collectors super hyped
So, any time a land goes into play under your control, you'll exile the top card in your deck and may play it for as long as it is exiled
Bell Borca, Spectral Sergeant and Umbris, Fear Manifest are secondary options that become substantial threats as we exile more and more of our opponents cards