Alteratron

Customize (As you cast this spell, for each set of
square brackets, choose one option and pay its cost.)
[({1}-When Alteratron enters the battlefield)
({3}-At the beginning of your upkeep)],
[({w}-target creature gets +1/+1 until end of turn)
({u}{dash}scry 1)
({b}{dash}each opponent discards a card)
({r}{dash}Alteratron deals 1 damage to any target)
({g}{dash}you gain 2 life)].