Tesla, the great inventor

Tesla gets a +1/+1 counter for each artifact you
control.
{u}{u}{t}create a legendary artifact token called teslacoil with, you may only have one teslacoil on
the battlefield at once and,{t}target creature, planeswalker, or player takes three damage.
{2}{u}{u}{u}all artifacts you control have, {t}deal
one damage to target creature or planeswalker
until end of turn.