Ravni, Weaveshaper

When Ravni, Weaveshaper enter the battlefield,
put +1/+1 counter on each creature.
When creature with any counters attacks, choose
a kind of counter that attacking creature, doesnt
have on it from among flying, first strike,
deathtouch, vigilance, hexproof, menace, reach, trample and +1/+1.
You may switch a counter of that kind with other counter on attacking creature.