Whenever you
castTo cast a spell is to take it from the zone it’s in (usually the hand), put it on the stack, and pay its costs, so that it will eventually resolve and have its effect. A player may cast a spell if they have priority. See rule 601, “Casting Spells.”
To cast a card is to cast it as a spell. (CR 701.5) a Spirit or Arcane spell, target opponent loses 1 life and you gain 1 life.
SoulshiftSoulshift is a triggered ability. “Soulshift N” means “When this permanent is put into a graveyard from the battlefield, you may return target Spirit card with mana value N or less from your graveyard to your hand.”
If a permanent has multiple instances of soulshift, each triggers separately. (CR 702.46) 2 (When this creature
diesIs put into a graveyard from the battlefield. (CR 700.4), you may return target Spirit card with mana value 2 or less from your graveyard to your hand.)