If an effect causes a permanent with station to become a creature by some means other than having the appropriate number of charge counters on it, it won't use any power and toughness values printed in its text box
The Instant spell is most often played in Commander decks like Lord of the Nazgul and Urza, Lord High Artificer
Worst-case scenario, you can flash it in at the end of your opponents turn and start attacking
If you want to improve the deck further and have the budget to do so, Arthur - Wizard's Apprentice is a very good card in an aggressive bounce deck
There arent enough hoops in the game to make a 1-mana Griselbrand fair
Perfect for learning the game, upgrading with booster packs, or joining weekly Lorcana league nights at Orange Claw Club in Santa Ana, this starter deck provides everything needed to begin playing immediately