Herald of the Corona

Flying
Equinox - At the beginning of combat on your
turn, if you control an odd number of lands, creatures you control gain lifelink and vigilance
until end of turn. If you control an even number
of lands, creatures you control gain deathtouch
and trample until end of turn instead.
"I am the solstice, the eternal dawn, the endless dusk.
I am the celestial truth, and I am your end."