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But milling yourself and cycling both rip through your deck to the point where you can draw your namesake card with high enough consistency to make it worth it

Whenever Underdark Beholder attacks, reveal cards from the top of your library until you reveal an instant, sorcery, or enchantment card with converted mana cost less than the number of eyestalk counters on Underdark Beholder

This can get interesting with stealing opponents creatures, ETB triggers, and other aristocrat shenanigans

Its power and toughness will be equal to the number of Rats you control (not the number of Rats you controlled when the token entered the battlefield)