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You can also just increase Polukranos's power/toughness with something like Eldrazi Conscription, which means Polukranos will lose his counters but not die due to them

Jizukiru, the Star Destroying Kaiju is a potential candidate to sit on an opposing monster before the Fusion Summon

It is a two mana Instant that gives target creature +2/+0 until the end of turn

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Most Level 3 "Mermail" monsters (excluding "Abyssdine" and "Abyssocea") have similar Trigger Effects that are triggered when they are sent to the Graveyard, which usually Special Summons another "Mermail"