I imagine merging advanced elements together would be the best course of action since it yields the greatest amount of xp (20 for the merge plus 5 for creating each element so 30 xp total). So anything requiring elements level 4 and above would be best.
I need 50 experience (2 30 experience mergers).
1+1..........4
1+2..........5
2+2..........6
1+3..........7
2+3..........8
3+3..........9
4+4..........Artemis arrow
4+5..........Butterfly
4+6..........Victory ear bonnet
4+7..........Victory saddle cloth
4+8..........Phanes egg
4+9..........Water trough
5+5..........Victory polo wraps
5+6..........Amber pinata
5+7..........30K equus
5+8..........Philotes’ stroke
5+9..........Stuffed unicorn
6+6..........Button plaiting
6+7..........Kairos dial
6+8..........Heracles gallop
6+9..........Achilles heel
7+7..........Custom clip
7+8..........Heracles trot
7+9..........Vintage apple
8+8..........Horseshoe studs
8+9..........Ow’s helios ray
9+9..........Aphrodites’ tears