I feel my above example of breaking the stack down makes the spell slinging more like spell slogging. Also how do resources work? Is it mana based? Something else? Card drawing? Traps? Auras? It could also be interesting to have multiple win cons.

Like what would powerful wizards be fighting over? There's killing each other. Maybe claiming a powerful relic and it has a set of enchantments to disarm, but your opponent could try and stop you. Of course decking your opponent as a way of saying "none of your magic could compete with me, you lose"