Gore-Magala, Rage Shadow

Flying, Menace, Hexproof
When Gore-Magala, Rage Shadow attacks for
the first time each combat, add a frenzy counter
onto a creature you control. (Frenzy counters add
Frenzy 1, Whenever this creature attacks and isn't
blocked, it gets +1/+0 until end of turn )
At the start of your upkeep, if creatures you
control have a total of six or more frenzy
counters, flip this card.