You'd need a sac outlet also, which is presumably how you're winning the game - it's a perfect respectable Impact Tremors deck combo, and there's nothing terribly wrong with the built transformation into a phoenix, hit for a couple of turns, and do it all again
Latios and Latias are just straight up not very good at all, not even worth playing a deck with them
Exchange that card with the top card of your library., so you basically just end up losing the game and probably a Swamp, but if you are able to cast a Darkpact you get to essentially trade your opponent a Swamp for whatever they anted - pretty dirty and cheesy, especially if they flip over a spicy rare
When Did First Editions Stop
Thats the way Id like to go out, thank you very much