Daxos's Torment [Commander 2015] Human Shaman Ally Set: Onslaught Type: Instant Rarity:

Set: Onslaught Type: Instant Rarity: Common Cost: {2}{W} You gain 6 life

Creatures with flying your opponents control get -1/-0

Set: Dragon's Maze Type: Sorcery Rarity: Common Cost: {1}{U} You may tap or untap target permanent

you may search your library for an Aura card that could enchant that creature

But I like this one

Daxos's Torment [Commander 2015] Human Shaman Ally Set: Onslaught Type: Instant Rarity:Set: Commander 2015 Type: Enchantment Rarity: Rare Cost: {3}{B} Constellation Whenever Daxos's Torment or another enchantment enters the battlefield under your control, Daxos's Torment becomes a 5 5 Demon creature with flying and haste in addition to its other types until end of turn. The terrors of the Underworld travel alongside those who return to the mortal realm.