Alchemist's Tactics

If you payed more {u} to cast Alchemist's Tactics, target creature gets -3/-0 until end of turn.
If you payed more {r} to cast Alchemist's Tactics, target creature gets +3/+0 until end of turn.
If you payed an equal amount of {u} and {r} to cast Alchemist's Tactics, ignore all changes made to creatures' power and toughness this turn.