Galazeth, Prismari Paragon

You may exile Galazeth, Prismari Paragon from your opening hand. If you do, learn. (You may reveal a Lesson card you own from outside the game and put it into your hand, or discard a card to draw a card.)

Flying

As long as you’ve learned three or more times this game,
you may cast Galazeth from exile.

You may cast instant and sorcery cards you own from exile
by sacrificing an Elemental creature rather than paying their mana costs.