Firnir, the Lupine Eruption

Haste
{r}: +1/+0 until end of turn. If this is the seventh
time you've activated this ability this turn, trigger
Ragnarok.
At the beginning of each opponent's upkeep, if
Ragnarok has triggered this game, that player
chooses target creature, player, or planeswalker
other than you or a permanent you control.
Fenrir, the Lupine Eruption deals 3 damage to
that target.