Summoning Portal
The magic lands abound with various beings that have been classified as follows: Humans, Animals, Undead, Magical, Monsters, Draconids, and Titans. All creatures have a certain level of rarity, which indicates the difficulty of obtaining such a card, and also the power of its attributes: Common (the weakest ones), Uncommon, Rare, Epic, and Legendary (powerful creatures indeed).
You may be lucky enough to encounter some creatures when following quest stories, get them as a prize for winning the Tournament of Mages, or, if Fortune favors you, find them in certain valuable chests. But mostly you will have to perform rituals in the Summoning Portal to add new creatures to your deck.
To perform such a ritual, you will need a combination of three Shards — you can obtain them in quest battles or steal from other battle mages if their summoning ritual is active. Just like creatures, shards have a certain rarity level from Common to Legendary. The higher the rarity of shards in your combination, the better you chance to summon a creature of higher rarity.

The creatures of Common and Uncommon rarity are the easiest to summon, but even in this case the ritual can fail, and instead of a card you will get a shard of the same or higher rarity. When you have summoned enough creatures, your Portal can produce duplicates of the cards you already have in your deck. They will be diffused into crystals.
You need some time to perform the ritual. During this period your castle is vulnerable to the attacks of other mages. If your defense forces are vanquished, the enemy troop will get a chance to steal one of the shards loaded into the Portal. In this case, your ritual will be suspended until you return to the Realm. You can take revenge on the assailant and take the shard back, or use a new shard to resume the ritual.

Useful tip: use the shards of the maximum available rarity to increase your chances to summon rarer creatures! Good luck with your rituals!
You may be lucky enough to encounter some creatures when following quest stories, get them as a prize for winning the Tournament of Mages, or, if Fortune favors you, find them in certain valuable chests. But mostly you will have to perform rituals in the Summoning Portal to add new creatures to your deck.
To perform such a ritual, you will need a combination of three Shards — you can obtain them in quest battles or steal from other battle mages if their summoning ritual is active. Just like creatures, shards have a certain rarity level from Common to Legendary. The higher the rarity of shards in your combination, the better you chance to summon a creature of higher rarity.

The creatures of Common and Uncommon rarity are the easiest to summon, but even in this case the ritual can fail, and instead of a card you will get a shard of the same or higher rarity. When you have summoned enough creatures, your Portal can produce duplicates of the cards you already have in your deck. They will be diffused into crystals.
You need some time to perform the ritual. During this period your castle is vulnerable to the attacks of other mages. If your defense forces are vanquished, the enemy troop will get a chance to steal one of the shards loaded into the Portal. In this case, your ritual will be suspended until you return to the Realm. You can take revenge on the assailant and take the shard back, or use a new shard to resume the ritual.

Useful tip: use the shards of the maximum available rarity to increase your chances to summon rarer creatures! Good luck with your rituals!