While playing with your hand revealed, you can still reveal cards to pay a cost.
2019-11-12
wotc
One a spell or ability has had another player choose modes for it, a player can’t choose to not finish casting or activating that spell or ability unless there’s no way for the player to complete the process. For example, the player can’t choose to not activate mana abilities to pay for the spell.
2019-11-12
wotc
If you need to choose a card in your hand without revealing it to other players (most likely because an effect instructs each player to discard a card), you can hide your hand while choosing one or use any other method to keep your choice secret.
Format Legality
Standard
Not Legal
Future
Not Legal
Historic
Not Legal
Timeless
Not Legal
Gladiator
Not Legal
Pioneer
Not Legal
Modern
Not Legal
Legacy
Not Legal
Pauper
Not Legal
Vintage
Not Legal
Penny
Not Legal
Commander
Not Legal
Oathbreaker
Not Legal
Standardbrawl
Not Legal
Brawl
Not Legal
Alchemy
Not Legal
Paupercommander
Not Legal
Duel
Not Legal
Oldschool
Not Legal
Premodern
Not Legal
Predh
Not Legal
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