Aggressive decks can't afford to just slam their creatures into your 5/5, and even midrange decks usually don't have creatures that top 5 toughness
The Dragon Wizard is joined by other creatures that deal damage or create tokens for casting spells
That makes it useful in just about any white deck, and thats being borne out so far in the new Standard, with the trusty pup being slotted into +1/+1 counter decks, vanilla aggro decks, and even some multicolored ones
REAL It depends on how old the card is, what colors are on the front, and whether the card has a blue core
Against the other two Aggro opponents I was happy to remain Selesnya without making my manabase worse curving out with my nice aggro deck with top curve bombs
We have a fairly strong deck but it has very little room for maneuver