bagon pokemon card LV.13 53/100 Stormfront Common Non Holo NM Dragon Type Bagon (52/107) [EX: Deoxys]

Since Desculpting Blast rewards you more for bouncing an attacking creature, the best play you could make is to block an attacking creature and then bounce it in response to a combat trick or something similar

Own this unique Colossification alter before its gone

Costing six ink, Raya, Leader of Heart, is a strong card thanks to its combination of stats and ability

This means printed cards dont always match the official rules text exactly, but the updated rules text is reflected online on Scryfall and in Magics database

On the whole, though, mulligans happen before the game has started, and cards are put straight back into your library, not discarded to your graveyard