For HIVE, probably using bittrex, although not sure how they work with credit cards deposits, I'm not from US. Then you will withdraw it to your Hive account.

For LEO, you can buy it on Hive Engine with Hive, or you can do it from Uniswap with Ethereum. You can get eth from coinbase, send it to your metamask and then buy WLEO on Uniswap. If you like it on your Hive account you will need to unwraped it. Have in mind the high eth fees, and use Uniswap only for large transfers.

For CUB, you migh want to wait for the leo bridge :), or use binance.com with VPN :) to withdraw funds to the BSC neetwork.
Another option for CUB is to wrap LEO to bLEO, and then use these funds for CUB. But you will need a small amount of BNB in that wallet to make transactions. I can send you some :)
More info about setting up the BSC network on metamask and the wraping/unwraping process in the cub docs
https://docs.cubdefi.com/