mtg exile cards from the top of your library until Jodah, Unifier (PDMU) #203p Wildsear, Scouring Maw (BLC) #8

Chaos: Whenever you roll Chaos, you may discard any number of cards in your hand

(And if you're still learning, even better, as MTG Arena is excellent for new players!) They have Sealed events starting June 25, and the play experience is still the same, great Magic

Using fling effects or Goblin Bombardment gives you ways to sacrifice your own elementals and deal damage with Omnath

You find this spell most often in combo decks, notably Legacy Reanimator, that want to check for interactive spells like Daze and Force of Will

In the early game it's just a five-mana Damnation, and in the mid-game it's an okay sweeper with a few dorks, later you can play around it and really push the board your direction