ARC Trooper Training

(Gain the next level as a sorcery to add its ability.)
Spells your opponents cast during your turn cost {1} more to cast.
{2}{w}: Level 2 - Creatures you control get +1/+1.
{4}{w}: Level 3 - Whenever you attack, until end of
turn, target attacking creature gets +1/+1 for each
other attacking creature and gains double strike.