I got a few infinity comboes in my elf deck, why not add a few more? These are a few cards which are not too expensive that will make it into my deck when I round them up
Words of Wilding - along with skullclamb and Ashnod's Altar should provide easy creature / mana / draw combo.
Mana Reflection - along with Grim Monolith should be easy infinite colorless mana
Argothian Elder - I'm sure I'll find something, it's cheap, so I can easily get it, and it's sure to generate a lot of mana, even without going infinite.
Umbral Mantle - Oh yea! Now we're talking.
Viridian Joiner - I don't have it, I need it!
Wirewood Lodge - suddenly Argothian Elder is a lot better