Hello,
I was recently played in PBE and i noticed a bug for combining this item.

Description:

- Champion: Hecarim
- Skin: Reaper Hecarim
- Bug: Cannot combine the item "Spirit of the Lizard Elder" when you already bought Spirit Stone and Pickaxe with 725 gold. However, the combination can be made when you have the Spirit Stone and 1600 gold(without the Pickaxe) or buy it straight from nothing

I found the same bug about spirit of the ancient golem, I posted a thread about it as well.

Since you both are onto this thread it'll explain it quickly,

In the Lissa patch(which got reverted) the Spirit's recipe items got changed, and since the patch got reverted it kind of got messed up since it shows you the old items but requires the new items to buy the items.

Confirmed on both the spirit of the ancient golem and Spirit of the lizard elder.

If what Trund1e said is true, then it would make sence why you can't buy them if you build it little by little but you can if you buy it all at once.

i cant buy it.....why Riot why.....