Olanar the thunderstruck

Trample,haste,lifelink
You Can not attack with this creature
unless you pay {7}.
Gain {e}{e}{e} every Other Turn.
{5}{t} Counter spell or ability.
{10}{t} gain control of target planeswalker.
{e}{e}{e}{e}{e}{e}{e}{e}{e}{e}{e}{e}{5}Kill every
creature under target players control as an additional cost, sacrifice 2 creatures.