Intruder Alarm- Seems bad?
Skyshroud Poacher- 4 mana 3/3? 3X Colorless mana- search a elf?
Mana Elves- Those are nice.

Alight, this is a 3 card combo.

Intruder Alarm-2U
Creatures do not untap during their controller's untap steps, whenever a creature comes into play, untap all other creatures.

Mana Elves- ??
Just elves that produces mana, Priest of titania would work.

Skyshroud Poacher- 2GG
3/3 - (3) Tap- Search your library for an elf card, then put it into play, shuffle your deck afterwards.

This combo gets all your elves out in one turn.
Figure it out yourself, it's pretty cool.