that deck is a very controlling deck, so one card that I am considering is Myrel, Shield of Argive, since she is a more powerful version of Grand Abolisher, although I certainly would be willing to hear other suggestions, as well
In summation: White seems very strong
Its also because children arent generally good at taking care of their belongings
The strength of Staff of Compleation is it is very good late-game when you have a ton of excess mana
(It's also not an enchantment they can kill to get their dork back, by the way) But by discarding it for an effect, you net the effect as well as a powerful madness theft of something at instant speed that can change the tables very quickly
Or being an old hat, having grown up listening to Lightning Bolt and then seeing Brian Chippendale have his first card art in Magic