Valkyrie, Winger Avenger

At the beginning of your upkeep,
add 1 charge counter to Valkyrie
Flash
{3}{t} - Deal 1 damage to 3 creature
target opponent controls,
they cannot attack this turn
{6}{t} - Remove 4 charge counters from Valkyrie,
Valkyrie and 2 other creature you control
return to their owners hand
on your upkeep they may be cast for free