Magic: The Gathering Oracle Changes - Core Set - Tenth Edition to Masters Edition

Old card (Core Set - Tenth Edition)	New card (Masters Edition)
Arcum's Whistle [Click to view all changes.]
Arcum's Whistle {3} Artifact {3}, {T}: Target non-Wall creature's controller may pay {X}, where X is that creature's converted mana cost. If he or she doesn't, the creature attacks this turn if able, and at end of turn, destroy it if it didn't attack. Play this ability only during the creature's controller's turn before attackers are declared. You can't target a creature that came under its controller's control this turn.	Arcum's Whistle {3} Artifact {3}, {T}: Choose target non-Wall creature the active player has controlled continuously since the beginning of the turn. That player may pay {X}, where X is that creature's converted mana cost. If he or she doesn't, the creature attacks this turn if able, and at end of turn, destroy it if it didn't attack. Play this ability only before attackers are declared.

Old card (Core Set - Tenth Edition)

New card (Masters Edition)

Arcum's Whistle [Click to view all changes.]

Arcum's Whistle

{3}

Artifact

{3}, {T}: Target non-Wall creature's controller may pay {X}, where X is that creature's converted mana cost. If he or she doesn't, the creature attacks this turn if able, and at end of turn, destroy it if it didn't attack. Play this ability only during the creature's controller's turn before attackers are declared. You can't target a creature that came under its controller's control this turn.

Arcum's Whistle

{3}

Artifact

{3}, {T}: Choose target non-Wall creature the active player has controlled continuously since the beginning of the turn. That player may pay {X}, where X is that creature's converted mana cost. If he or she doesn't, the creature attacks this turn if able, and at end of turn, destroy it if it didn't attack. Play this ability only before attackers are declared.