Aquaman vs Loki
Aquaman has his golden trident. Loki has his mind scepter. Both in full armor.
Fight takes place in the waterfall arena of Wakanda (where T'Challa fought M'Baku). There's a bit of water there so Aquaman can do his water spear shield thing. On Loki's part, he's not allowed to use mind control but is allowed the rest of his powers.
Combatant can win via killing their opponent, making them yield, or throwing them off the cliff. Who wins?