Pack's Favor [Guilds of Ravnica]

$0.25
Type: MTG Single
Title
Set: Guilds of Ravnica
Type: Instant
Rarity: Common
Cost: {2}{G}
Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for {1} or one mana of that creature's color.)
Target creature gets +3/+3 until end of turn.
Selesnya grows its ranks in more ways than one.