Batamino, a variant on War, has been designed for small children.
Each player makes a deck with their cards, that they put face down in front of them. Each players turn over the first card from their deck at the same time. The one who puts down the biggest animal wins all the other cards
Children who don’t know how to count can easily spot who wins by comparing the sizes of the animals described on the cards.
The winner of the game is the player who ends up with all the cards.