The strength of elves is a combination of their ability to flood the board with creatures and generate tons of mana, which can then be filtered into card draw or some sort of game-ending board pump effect
After you've tried those basic rules, there are plenty of ways to play, so finding a format that you enjoy is really important when first learning about Magic
1 Display of Power
7 Robin Hood: Champion Of Sherwood Card Number 190/204, Steel Ink Robin Hood: Champion of Sherwood has the Shift mechanic, which means he can be played on top of another Robin Hood or Morph card for only three ink, although even at five ink, this card is a steal
The Ringhart Crest forces you to pick a tribe and it can tap for a Green mana that you can only use to cast a creature of the chosen type or a legendary creature
If you simply cast this spell from your hand for 3 mana, it will deal 2 damage to each opponent and each creature they control