Assuming we are just looking at damage, and a base 50% to hit. Also assume that burst 1 powers hit 2 enemies and burning hands hits 3 enemies... After two rounds we have:
Tiefling wizard: 55% to hit, +5 damage (20 int) icy terrian (2), then scorching burst (2) = .55(4d6+20) = 18.7 damage
Elf...