Nessuna delle due: predatore e' un'abilita' statica che ti consente di giocare la spell con un costo alternativo, quindi il tuo oppo non puo' stiflare nulla!
Comprehensive Rules ha scritto:
702.73a Prowl is a static ability that functions on the stack. “Prowl [cost]” means “You may pay [cost] rather than pay this spell’s mana cost if a player was dealt combat damage this turn by a source that, at the time it dealt that damage, was under your control and had any of this spell’s creature types.” Paying a spell’s prowl cost follows the rules for paying alternative costs in rules 601.2b and 601.2e–g.
