Legolas Greenleaf

Reach
Legolas can't be blocked by creatures with power 2 or less.
Whenever another legendary creature you control enters, put a +1/+1 counter on Legolas.
Whenever Legolas deals combat damage to a player, draw a card.

Tales of Middle-earth Commander

Reach
Legolas Greenleaf can't be blocked by creatures with power 2 or less.
Whenever another legendary creature enters the battlefield under your control, put a +1/+1 counter on Legolas Greenleaf.
Whenever Legolas Greenleaf deals combat damage to a player, draw a card.

If Legolas Greenleaf enters the battlefield at the same time as another legendary creature you control, Legolas's Greenleaf's third ability will trigger and put a +1/+1 counter on it.

Reducing a creature's power after it has blocked Legolas Greenleaf will not remove that blocking creature from combat or make Legolas Greenleaf unblocked.