You get to pick and choose which cards you want to discard, of course, letting you keep the best cards you have
That means double value from all your Sword of X and Y triggers
Stalwart Unity wins that battle hands down
While many of them would be interesting spaces to explore and delve into from a design perspective, they're still only filled with untapped potential (at least, at the time of writing)
Its power spikes when activated from the hand at the end of the Battle Phase , allowing players who are behind to reset the game state instantly
However, for now, this answers many unanswerable problems at the kitchen table, from Planeswalkers to creatures, from artifacts to enchantments, and all at instant speed