one piece card game st21 Trading Starter Deck EX Gear 5 Single Card Common Brook ST21-012 Is ST-21 Worth It? :

No, transforming a creature doesnt remove it from combat , unless its exiled and then brought back like with the flipwalkers

This won't affect Phoebe, who presumably still has the one she stole from the original creature

You need lots of cheap spells to take advantage of that since it only makes 1 mana at a time, which typically translates to cantrips and spellslinger

1 Opportunity

Delaying Solemnity I also use a combo that might get you kicked out of the table if you use it too much

Invasion of Mercadia / Kyren Flamewright With any list, there needs to be a last-place entry, and Invasion of Mercadia is the entry here