Board Thread:Game Discussion/@comment-24705123-20131228033320/@comment-11482499-20131231073209

Mirage is actually a pretty "weak" R5 (no surprise - he's free), being the 19th best card in the game only. So pretty much all x10 raids or T1 rewards recently have been stronger than Mirage.

AT's Def, if he is in Leader row, is very high. He also has the highest HP in the game. He has the second-longest lifespan in the game (behind Nova Prime), living 33% longer than Galvatron does. Mathematically, it more than makes up for his weaker atk.