Rune Summoning is available under the Shop feature. Under the "Summon" tab, you are able to choose between two options - Buy One or Buy Ten. The cost for buying one costs 180 Runes and you will receive a random card other than common or uncommon cards that can't evolve. You receive 1 Universal Piece for each summon and there is a percentage chance that you will receive an Epic card. You're able to see that percentage below the title of "Summon Top Cards" and that percentage rises every time you do not receive an Epic card but resets when you do. The other option is to Buy Ten at a time which grants the user an 11% discount on the price of Runes which comes out to 1500 total Runes and almost guarantees an Epic card.