Appearing in Into the Inklands selection of emerald cards, Ursula, Deceiver of All costs three mana to play - or can alternatively be added to your inkwell - in return for two strength, three willpower and a single point of lore
If you cast a creature spell this way, it gains haste until you lose control of that creature (or, in rare cases, you lose control of the creature spell while it's on the stack)
It seems that this card is spiking simply because it has a strong effect and is super rare, with demand suddenly outstripping supply and then rising higher as interest in the spiking card grew
Something so dangerous and uncontrollable, yet helpful and beautiful at the same time
Then search your library for a basic land card, put it onto the battlefield tapped, then shuffle