XYZ Hyper Cannon (Super Rare)

You must control XYZ-Dragon Cannon, or a Fusion Monster that lists XYZ-Dragon Cannon as material, to activate this card's effect. This card's effect depends on whose turn it is.
? Your turn: You can target 1 of your banished Union monsters; place it on the bottom of your Deck, and if you do, draw 1 card.
? Your opponent's turn: You can discard any number of cards, then target the same number of cards your opponent controls; destroy those cards.
You can only use this effect of XYZ Hyper Cannon once per turn.