Sylvain, Nature's Gladiator

Double Strike, Trample, Haste
{2}{r}: Sylvain, Nature's Wrath deals 3 damage to target nonland permanent an opponent controls.
{5}{b}, {t}: Pay X life. Target opponent sacrifices
all creatures with power or toughness equal to or
less than X. Creatures sacrificed this way do not
cause abilities of permanents to trigger. If X is 10
or greater, untap Sylvain, Nature's Wrath.