most expensive mtg doctor who cards Duggan, Private Detective Price & Card Details — you may exile a card from your hand with a number of time counters on it equal to its mana value Unloved Doctor Who MTG card

If the target creature's power is increased to 3 or greater after Deserter's Disciple's ability is activated but before it resolves, the ability doesn't resolve

Most other card quality effects give you one new card right away and/or afford quality of draws in subsequent turns but Brainstorm offers its action right away

Wizards of the Coast (October 18, 2023)

A flash-able walker of the planes is strong since they cannot be attacked by foes for a full round, and you can still user her ability once

This design allows WotC to print powerful, complex cards for Constructed at higher rarities so they dont unbalance the Limited format

If you pick something like Isochron Scepter, you can both tax the casting and stop its ability altogether