ネクロバインダー

• Type: Skill
• Cost: 2
• Effect: Summon 4. Gain 7 Block.

Upgraded

• Cost: 2
• Effect: Summon 5. Gain 9 Block.

For 2 energy, one card that heals Osti (Summon 4-5) AND gives the player 7-9 Block. One card does the whole job — keeps Osti alive while protecting your face — which makes it a solid defensive staple for any Osti-dependent deck.

Cost efficiency is a bit soft on paper, but the dual-purpose utility of Summon + Block is hard to beat. With Danse Macabre (play a 2+ cost card, gain Block), extra Block piles on top. High synergy with Osti-HP-dependent cards like Unleash and Protector.

Rating: B-tier (support Skill that balances Osti sustain and defense)

• When Osti's HP drops, Aggro restores it and brings Unleash / Protector damage back up
• With Danse Macabre out, each 2-cost Aggro adds another 3-4 Block on top
• Upgraded (Summon 5, 9 Block) is worth prioritizing in Osti-axis decks
• Especially valuable as pre-boss Osti HP maintenance

• Unleash: max damage when Osti HP is full, so Aggro as a pre-play heal is ideal
• Danse Macabre: extra 3-4 Block every time the 2-cost Aggro is played
• Protector: scales on Osti max HP. Keep Osti topped up with Aggro to keep the damage high
• Necromastery: converts Osti HP loss to AoE damage. Use Aggro to precisely manage Osti's HP