How to Get Legendary Cards (did you experience this too?)

I think there is a secret algorithm where if you don't play a certain God for a long time or use a certain type of card (neutral) in your decks, the game will add a higher chance of you getting legendary cards in that category of cards during your next unpacking of free cards. I have 3 Legendaries of a certain GOD and 2 neutral cards recently because I don't play those cards in my deck.