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Next turn, Summon 2 and gain [energy:2].
Invoke is a powerful setup tool that sacrifices immediate momentum for a high-impact following turn, providing both defensive scaling for Osty and additional energy. It is best used when preparing for a turn where you need to play multiple high-cost cards or when Osty's health pool needs a significant boost to survive incoming attacks.
Protector
Protector deals additional damage based on Osty's Max HP, meaning the Summon stacks from Invoke directly increase its damage output. The extra energy provided by Invoke also helps pay for Protector's cost alongside other defensive cards.
Necro Mastery
Necro Mastery converts Osty's lost HP into damage against all enemies, so increasing Osty's HP pool with Invoke provides more 'fuel' for this offensive engine. The energy gain from Invoke also facilitates playing Necro Mastery and other Summon cards in the same turn.
Bound Phylactery
This relic provides passive Summoning at the start of every turn, which stacks with Invoke's burst of Summoning to rapidly build Osty's health. This combination ensures Osty remains a durable companion without requiring the player to spend energy on Summoning every single turn.
Ice Cream
Since Invoke provides a surplus of energy on the following turn, Ice Cream ensures that any energy not spent on that high-impact turn is conserved for future use. This prevents the energy gain from being wasted if your hand lacks enough high-cost cards to utilize the full bonus.