Elsbay, Dual-shifter

Flash
You may exchange Elsbay's power and toughness
at any time.
If Elsbay's power is greater than its toughness, it
gains trample and loses infect and flying.
If Elsbay's toughness is greater than its power, it
gains flying and infect, and loses trample.
Counter all spells targeting Elsbay.