Gen 1 Themes

Flow

Grants additional abilities if it's not the first card played in the turn.

Battle Mastery

Gives you a choice between two abilities.

Sacrifice

Grants additional abilities if you discard a card.

Domination

Grants additional abilities if your Bakugan hold the most BakuCores.

Fury

Grants additional abilities if you have no cards in hand.

Turbo

Grants additional abilities if you have the most Energy cards.

Aurelus Power

Grants additional abilities if you have an {Aurelus} Bakugan on your team. Likely works best in 3-faction decks, and likely pairs well with Battle Mastery and cards that gain extra abilities if you've played cards from three factions in one turn.

Underdog

Grants additional abilities if the Bakugan has a lower {BPower} than the opposing Bakugan.

Gen 2 Themes

Boost

Grants additional abilities if you have seven or more Energy cards.

Trifecta

Grants additional abilities if your Bakugan have three of more BakuCores attach to them.

Empower

Grants additional abilities if you pay an additional 3{Energy}.

Rapid Fire

The second Rapid Fire card you play each turn is free.

Sync

Grants additional abilities if you reveal a card from your hand that matches the Sync criteria .

Instabrawl

These are hero cards that can be played for their original cost, or be played for their cheaper "instabrawl" cost to put the hero into play and destroy it at the end of the turn.

Gen 3 Themes

Scrounge

Grants additional abilities if the top card of your deck matches the Scrounge criteria or if the Scrounge card is revealed from the top of your deck.

Stoke

When you play a Stoke card, you may pay an 3{Energy} to gain its effect a second time.

Inspire

Grants additional abilities if you have drawn an extra card that turn.

Rally (partially released)

Grants additional abilities if you have three or more heroes in play. This would have built upon a previous theme in Gen 1 and 2.

Flex (unreleased)

Grants additional abilities if you have a card in play that costs 4{Energy} or more.