Prized Collector, Kagura

Haste, Vigilance
When Kagura enters the battlefield, or at the beginning of your upkeep, look at the top 5 cards
of your library, search for any instant/sorcery
spell(s) from among them, add that card(s)
to your hand, and put the rest of the cards back
on the bottom of your library in any order.
{u/r}{t}: The next instant/sorcery spell you cast this
turn costs X less, where X is the number of instant/sorcery(s) you've casted this turn.