Finding a Moltensteel Dragon, pumping it up at least 6 times, then turning it into Skithryx, the Blight Dragon for lethal Infect damage in the middle of combat is a classic, but there are plenty of other shenanigans if youre willing to explore the increasing pool of Dragons
Kefka, Dancing Mad My favorite card from this set is this seven-drop legendary Rakdos game winner with indestructible on your turn
Try to pack some tools in your colors that will extend the game or dig you deeper into your deck, like cheap removal spells, counterspells, card drawing, and board sweepers like Wrath of God and Damnation
Building two decks around the mechanic was a blast, and every time I win by flipping a face-down Phage the Untouchable, it rules
Both also have a bunch of alternative utility