The best things in life are free, but the best troops in Runeterra cost mana. You can see the cost of a card by looking at the blue circle in the upper left corner. That’s the mana cost!
How much mana do I have?
Your mana is located on the center right of the screen beneath The Button. Your opponent’s mana is visible to you as well, and it’s located above the The Button.
How do I get more Mana?
You start with just 1 mana gem unlocked. At the start of each new round, your mana will refill, and you will unlock an additional mana gem.
For example: Round 1, you’ll have a maximum of 1 mana, but later, in Round 8, you will have a minimum of 8 mana to use for that round! There are spells and abilities that unlock mana gems sooner, so be sure to check those out if you’re running a deck with a lot of high-cost cards!
What happens to unused mana at the end of a round?
It converts into spell mana which can be used to play Spell Cards (and only Spell Cards). Up to 3 spell mana can be banked at the end of a round from your unused mana.
For example, if you have 2 mana gems at the end of a round, that mana is converted into 2 spell mana for use in the next round. Pretty efficient, huh?
Note
When playing spells, your spell mana will deplete first for the cost of the spell. This allows you to play more powerful spells in earlier rounds, so be sure to explore the possibilities!
That’s all pretty cool, but...how do I play a card?
Haha! We’ve saved the most crucial step for last. When it’s your action, if you have a card in your hand whose cost is less than or equal to your remaining mana, that card will glow blue-white.
When you play a card, its mana cost will be deducted from your total. If it's a spell, the cost is drawn from the spell mana first, and then from regular mana.