Board Thread:Game Discussion/@comment-5573466-20130505204212/@comment-8284783-20130508212156

Optimx wrote: You can get R4's by getting them through an event space bridge, points rewards for battling bosses, or last, as a reward for your final rank in the event.

you could also shell out money for an event "pack"

Just a small precision: you cannot get "raid cards" through the final rewards for your rank, as that would be kind of pointless (their X3/X5 bonus would no longer be active :P).

The only ways are through the episode space bridge using medals or by buying packs.

Note that some of the packs bought with mobacoins will offer garanteed raid cards (I believe it goes 900 coins - once - for 3 packs including one X5 raid card, then 1500 coins - twice - for 5 packs including one X5 raid card, and then it goes to 3000 coins - as many times as your wallet will allow you - for 10 packs including one X5 raid card).

There is a similar deal to get the X5 raid card's weapon (prices are different, but the idea is similar, packs are limited in the number of times you can buy them and increase in price each time).

For the X3 raid card, you could also obtain it using medals or packs, but it is also given out as a reward once you reach a given bounty points threshold. Last event, it was 60K for Episode Slipstream robot form, 200K for Episode Slipstream alt form, 500K for Episode Slipstream's Weapon and 1mil for Episode Flamewar's Weapon, IIRC).