Boon of Boseiju
From Kamigawa: Neon Dynasty set
Boon of Boseiju
Instant
Target creature gets +X/+X until end of turn, where X is the greatest mana value among permanents you control. Untap it.
Target creature gets +X/+X until end of turn, where X is the greatest mana value among permanents you control. Untap it.
