Swat lets you change all of the targets of a spell not just one making it the best way to interact on the stack outside of conditional answers like Pyroblast
Morph, for those who don't know, is an adorable character from Treasure Planet, an excellent, if often forgotten, Disney film from way back in 2002
Red and White (RW) The colors Red and White synergize with the Backup mechanic while the cards themselves are aggressive
Nahiri, the Harbinger and Ugin, the Ineffable can also provide repeatable card draw, though their other abilities will probably be used more
Given, of course, that she's exerted and able to be challenged
Dolmen Gate makes all your attacks much safer and helps you keep attacking turn after turn