If this card is in your Graveyard: You can banish 1 other Plant-Type monster from your Graveyard; Special Summon this card from your Graveyard and increase its Level by the Level of that banished monster. Each player can only activate the effect of "Spore" once per Duel.
Aromage is a deck of Plant type monsters giving you lots of banish options when reviving Spore. Banish Aromage Jasmine to revive Spore and use Spore with Aromage Rosemary to Synchro summon into a level-7 monster.
Sylvans are a Plant archetype that are good at milling their own deck. You can use their effects to put Spore into the graveyard with other Plant monsters for Spore’s revival.