IG-100 Magnaguard

When IG-100 Magnaguard enters the battlefield, create four 1/1 colorless battle droid creature tokens.
Whenever IG-100 Magnaguard attacks, you may tap X untapped battle droids you control. If you do, IG-100 Magnaguard gets +X/+0 until end of turn and deals X damage to the player or planeswalker it's attacking.