Sora, Friend Uniter

Legendary creature you control have +1/+1.
Legendary creatures you control have first strike
if a legendary creature you control has first strike.
The same is true for deathtouch, double strike, flying, haste, hexproof, indestructible, landwalk, lifelink, menace, reach, trample, and vigilance.
Whenever you cast a legendary spell, add one
mana of any color to your mana pool. If that spell
had mana cost 5 or greater, add two. You do not
lose this mana as steps and phases end.