Then the first time your foe lost life in their turn you'll draw and put a +1/+1 counter here
The card itself reflects how Rydia's appearance turns the tide of battle in your favor, either by buffing your creatures, or allowing you to get some back from the graveyard
Typically reserved for supplemental sets, those like Commander products, Conspiracy, and Universes Beyond, it is a powerful ability that encourages combat interactions during multiplayer games
But I dont think many players really find that style exciting unless you can also couch it within a more multi-dimensional, coherent theme
No matter which you get, they are always some of the best pick-ups for any fan
It putsa 2/2 blue Drake creature token with flying into play anytime you cast an Instant or Sorcery