Success Sparks:
1) Lazy Tree Spirit
2) Owl Treant
3) Tough Tree Spirit
4) Treant Stub

I had real good Success with:
1) Owl Treant
2) Tough Tree Spirit
3) Young Treant
4) Treant Crystal Tree

For fails this works 7/10:
1. Twin-Headed Treant
2. Scream Treant
3. Rooted Old Wood Treant
4. Lazy Tree Spirit

1 Owl Treant
2 Small Treant
3 Treant Crystal Tree
4 Old Tree Treant