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Rather than specifically needing combat damage, Sigil of Sleep will work with any form of damage at all

Yawgmoth, Thran Physician is an S-tier proliferator, since it does so much other stuff on top of that ability, and even distributes its own -1/-1 counters to give you something worth proliferating in the first place

Swallowtail Butterspy Type Effect Monster Attribute DARK Typing Warrior Level/Rank 4 ATK 1800 DEF 1200 Archetype Butterspy Typings Effect TCG Date 2012-04-28 OCG Date 2012-02-18 Card Text When another monster you control inflicts battle damage to your opponent: Target 1 face-up monster your opponent controls

Runo also has to stay in play in order to be flipped