Seeds of Tomorrow (Blue)

You cannot play this if you don’t have a card in your arsenal to put on the bottom of your deck to pay for its additional cost.

You cannot play this from your arsenal unless you have another card in your arsenal to put on the bottom of your deck.

This is a shielding-prevention effect that prevents the next 5 damage in total that would be dealt to your hero. This can be over separate events of damage (i.e. 1 damage, then 1 damage, then 3 damage).