Corona

Whenever a Virus creature enters the battlefield, put three +1/+1 counters on every virus you control.
{t},{5}: Tap any creature.
{t},{7}: Tap all creatures.
{t},{9}: Take an extra turn after this one. This can only be used once and only as a sorcery.
At the beginning of combat on your turn, choose a kind of counter at random that Corona doesn’t have on it from among flying, first strike, deathtouch, hexproof, lifelink, menace, reach, trample, vigilance, and +1/+1. Put a counter of that kind on Cor