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Rengar has four printed Might and Assault 2. With Gauntlets, he is seven Might normally and nine while attacking. That reaches three excess against an ordinary six-Might defender, giving you both the Legend's ready opportunity and the Gauntlets draw if you conquer. Gauntlets still costs three Energy to play. Its Equip costs three Energy and one Power of any domain, with only the Energy reduced by the target's current Might. Rengar makes that Energy payment zero; an unboosted two-Might Hero leaves one Energy to pay.

Battleaxe gives Hero +4 Might, taking it from two to six and making it Mighty. Deathgrip can kill that Hero, give its current six Might to another friendly unit for the turn, and draw one. Hero's Deathknell draws two more. The Equipment stays on the board after its bearer dies, so a later attachment can reuse it. Deathgrip's kill happens during resolution, not as an upfront cost. If Tactical Retreat replaces the death with a recall, you get neither the Might transfer nor Hero's two-card Deathknell; Deathgrip's own draw still happens.

Peacekeeper stuns an enemy here when she first becomes an attacker in a combat. Ambushing her into your ongoing attack can trigger it; ambushing her as a defender does not. Kennen can pay two Energy on play or attack to stun a unit and gains two Might while there is a stunned enemy here. A stunned defender still has its Might and still needs lethal damage assigned to it. On a conquest that draws through Kai'Sa and readies through the Legend, choose the ready target and pay the Legend's exhaust cost before either ordinary trigger resolves. You cannot wait to see Kai'Sa's draw before choosing.