Bandai is releasing the Battle Spirits Collaboration Starter Pack Toho Monster Total Attack (PB02), the pack includes 40 cards (15 types), a special card (Borosilicate glass), and sleeves to store them (50). This includes many classic monsters from the Toho Godzilla series (listed below in Japanese). The pack can be pre-ordered now from Bandai with release scheduled for Sept 2019.

ChetArt's Kaiju Baseball imagines an alternate universe in which kaiju creatures from the Godzilla, Gamera, and Ultraman worlds play baseball. The Demon Monster League is comprised of 4 teams with 9 players represented for each: Tokyo Terrors, Matsumoto Mutants, Fuji Fiends and Kyoto Kaijus. This parody mashup of Japanese monster and baseball fun is represented as a collection of baseball trading cards, an 18″ x 24″ poster and a selection of t-shirt designs. Click the here to check out there site and browse there online shop.

Battle Spirits collaboration booster "Toho Monster Decisive Battle" aka Battle Spirits Toho Monsters Great Battle! is a supplementary set in the trading card game. The set included spirit, brave, magic and nexus cards in the color of red, green and white. It will be release on March 7 2015. There are 52 Cards total, with an extra 5 cards which are rare.  Case pack is approx $35 US, individual pack approx $2 US.
Confirmed Monsters Thus Far:
GODZILLA(2014)
GOJIRA (Including various other incarnations)
DESTOROYAH (Adult and Aggregate Form)
SPACEGODZILLA -X Rare Card
MOTHRA 1992 (Adult and Larva) X Rare Card
BIOLLANTE (Adult)
KING GHIDORAH 1991 -X Rare Card
MECHA KING GHIDORAH 
MECHAGODZILLA 1993 
KIRYU -X Rare Card
GIGAN GFW MODIFIED 
RODAN GFW
BATTRA
MECHAGODZILLA 1974
There are 52 Cards total, with an extra 5 cards which are rare. 
Check out the promo video and a few of the cards below.