The Nightwatcher, Gift Giver

Convergence — If there are four or more
legendary permanents on the battlefield, remove
the words in square brackets.
{t}: Choose one — •Another target creature you control gets +4/+4 until end of turn. [Tap that creature and put a stun counter on it.] •You draw
two cards, then discard a card, [then discard
another card.] •Until end of turn, all creatures
you control gain "{t}: Add one mana of any color.
[Put a stun counter on this creature.]"