Niko, The Messiah

Whenever Nico, The Messiah enters the battlefield under your control, search your library and/or graveyard for a card named The Sun, and put it
onto the battlefield.
Whenever you cast a blue spell, you may draw a
card, if you do discard a card
Whenever you discard a white card, put X Flying and/or Lifelink and/or +1/+1 counters on target
creature, where x is the
mana cost of the discarded card.