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(1) Once per turn, during your opponents End Phase: Gain 1000 LP

Lulu is probably the most universally applicable card here since it has a Proliferate ability

Honorable Mention #2 - (#12 Overall) - Benevolent Hydra Unlike most Hydra, this has a base size of 1/1, which matters for things like a foe casting Living Death, so it'll stay

As a Planeswalker, Ajani can draw attention away from the player themselves, even if the player never gets to activate his ultimate ability

UR Ultra Rare Unchained Soul of Anguish X DARK Link 3 [ FiendLinkEffect ] ATK 2400 DEF - 2+ monsters, including an "Unchained Soul" monster You can target 1 face-up monster your opponent controls