Flying, vigilance

Flying
When this creature enters, draw a card, then discard a card.

: This creature gets +1/-1 until end of turn.
: Switch this creature's power and toughness until end of turn.

Trample
Whenever this creature attacks, it gets +1/+0 until end of turn for each other attacking Aurochs.

: This creature can't be blocked this turn except by Walls. Sacrifice this creature at the beginning of the next end step.

: This creature gets +0/+1 until end of turn.

First strike, haste

Banding (Any creatures with banding, and up to one without, can attack in a band. Bands are blocked as a group. If any creatures with banding you control are blocking or being blocked by a creature, you divide that creature's combat damage, not its controller, among any of the creatures it's being blocked by or is blocking.)

This creature can't attack unless defending player controls an Island.

At the beginning of your upkeep, you may have this creature become the color or colors of your choice. (This effect lasts indefinitely.)

Flying; first strike; banding (Any creatures with banding, and up to one without, can attack in a band. Bands are blocked as a group. If any creatures with banding you control are blocking or being blocked by a creature, you divide that creature's combat damage, not its controller, among any of the creatures it's being blocked by or is blocking.)

: This creature gets +1/+0 until end of turn.

At the beginning of your upkeep, put a spore counter on this creature.
Remove three spore counters from this creature: Regenerate this creature.