Silence

Not affected by Cooldown means it can tap the turn it enters the Garden, so root and destroy in one turn. A root card plus Silence from hand is too much for one turn (Entangled Fate 3 + 8 = 11 IKZ), so play Silence into your Alley first and portal it in on the root turn: portaling costs no IKZ. Entangled Fate, Stillness and Lord of the Woods, Kasumigami all set it up.

Health 5 or less covers 554 of the 568 entities in our 17 community lists. It checks current health, so an entity damaged earlier in the turn counts.

Tapping uses Silence for the turn: it destroys or it attacks, not both. It untaps each turn, so once it is in your Garden every root card you play is also a destroy. Destroy isn’t an attack, so Defender can’t stop it, and Carapace doesn’t matter: a Rooted Ishimaru (4 health) goes. Lord of the Woods, Kasumigami (8 health) is out of its reach.

It is a bigger version of The Tremblin’ Beanz: the Beanz sacrifices itself to destroy a Rooted entity with 1 health, Silence stays and reaches 5. Its own 5 health is inside Killing Mist’s reach (base health 7 or less), and an opposing Entangled Fate can root it, which stops its attacks but not the ability.

Tanglehold Gate roots on every portal, so the full Earth deck gives Silence more targets: portal Silence itself (Gate Power 5) and the Gate roots an entity with base health 5 or less for it to destroy. The Pale Lady’s root ends as your turn starts, so it never feeds Silence.