0 casting cost

[Avodroc20]

Ive seen 2 cards so far that cost 0 mana to put out. Are there a bunch of cards like this? (Obviously not land)
If so, can someone link a couple?
--I'm just curious

[rarehuntertay]

http://magiccards.info/query?q=mana%3D0+%28t%3A%22artifact%22+or+t%3A%22creature%22+or+t%3A%22enchantment%22+or+t%3A%22instant%22+or+t%3A%22planeswalker%22+or+t%3A%22sorcery%22%29&v=card&s=cname

Here you go: note that this list does contain artifact lands, suspend cards with no casting cost, and transform cards...
Also, this does not belong in rules...