Effects that modify the creature's power or toughness (such as the effect of Giant Growth) will apply no matter when they started to take effect
However, if you're upgrading this precon, she's worth splurging on
Ill narrow down what classifies as a group slug card, then rank them from sluggish to sluggiest
My beef boils down to the fact that we already had a great 1/1 green token to fit this role mechanically (elves), so WotC is just trying to be cute
Path Of Annihilation One generic, one green Enchantment Devoid (This card has no color.) When Path of Annihilation enters the battlefield, create two 0/1 colorless Eldrazi Spawn creature tokens with Sacrifice this creature: Add one colorless Eldrazi you control have Tap: Add one mana of any color. Whenever you cast a creature spell with mana value 7 or greater, you gain 4 life
But considering its other perks, this might be better than the original Elvish Piper