You can turn a 0 into a -1. Sources that would deal 0 or less damage don’t deal any damage, even in silver-bordered games.
2018-01-19
wotc
You can change the numeral inside of a mana symbol, but you can’t modify the cost of a spell in time to pay less for it. It must already be on the stack to be a valid target for More or Less.
2018-01-19
wotc
You can change the number of sides on a die. If you don’t have any five-sided, seven-sided dice, or d21s handy, you can use other dice to simulate the rolls.
2018-01-19
wotc
You can change the number of dice rolled for an effect only if the original instruction included a number word to describe how many dice to roll. You can’t change the “a” in “roll a six-sided die,” but you could change the “two” in “roll two six-sided dice.”
2018-01-19
wotc
You can change power or toughness. If you change a toughness of 1 to 0, the creature will probably die.
2018-01-19
wotc
Indefinite articles such as “a” in “draw a card” aren’t number words and can’t be modified.
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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