Ancient Sky Arena

{t}, Add {1} to your mana pool.
{t}, Target opponent flips a coin. If heads, they
choose a creature first. If tails, you choose a
creature first. The target creatures fight each
other, with the coin flip's winner's creature
getting +1/+1.
"This is where some of the first battles for Earth
took place. It was here that I became familiar with
the human concept of being a knight, This is what
you must become." —Pearl