As Favored Enemy enters the battlefield, note the most prevalent creature type in an opponent's library.

When Favored Enemy enters the battlefield, target creature you control fights up to one target creature you don't control.

Whenever a creature an opponent controls of the noted type dies, put a +1/+1 counter on target creature you control.

Constellation — Whenever an enchantment enters the battlefield under your control, Favored of Iroas gains double strike until end of turn.

Whenever Pantlaza, Sun-Favored or another Dinosaur enters the battlefield under your control, you may discover X, where X is that creature's toughness. Do this only once each turn. (Exile cards from the top of your library until you exile a nonland card with that mana value or less. Cast it without paying its mana cost or put it into your hand. Put the rest on the bottom in a random order.)