Dragon-Scarred Bear #183
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Card Details
Formidable — 
: Regenerate this creature. Activate only if creatures you control have total power 8 or greater.
“Bears are a delicacy for the Atarka. The few that remain are the toughest of their species.”
3/2
Illustrated by Lars Grant-West
Rulings (3)
Feb 25, 2015
If you control a creature with power less than 0, use its actual power when calculating the total power of creatures you control. For example, if you control three creatures with powers 4, 5, and -2, the total power of creatures you control is 7.
Feb 25, 2015
Other formidable abilities are triggered abilities with an "intervening 'if'" clause. Such abilities check the total power of creatures you control twice: once at the appropriate time to see if the ability will trigger, and again as the ability tries to resolve. If, at that time, the total power of creatures you control is no longer 8 or greater, the ability will have no effect.
Feb 25, 2015
Some formidable abilities are activated abilities that require creatures you control to have total power 8 or greater. Once you activate these abilities, it doesn't matter what happens to the total power of creatures you control.