The only way to get Axie right now is to grind SLP and then sell it. You can attempt to breed Axies for certain, high-value features if you have the time, ETH, and motivation, but you’ll be at the mercy of the market once again. To combat for SLP, the alpha requires an initial investment of three axes, and the time it takes to recoup that investment varies based on skill and the movesets of the axes you buy.