Casual Frogs

My brother in law and I are building a frog deck for my niece (she's crazy
about 'em. Go figure). Our efforts so far:

4 Omnibian
4 Plaxcaster Frogling
4 Spore Frog
4 Golgari Guildmage
4 Urborg Elf

4 Peer Pressure
4 Beacon of Creation
4 Lay of the Land
4 Worldly Tutor
4 Perilous Research

4 Mirrodin's Core
8 Forest
6 Island
2 Swamp

Our basic plan is to use Spore Frog + Golgari Guildmage to prevent all
combat damage, and Omnibian + Peer Pressure to steal whatever win condition
the opponent plays.

Beacon of Creation makes an endless supply of bugs for the guildmage, as
well as random 3/3 attackers and blockers.

It's not too bad so far, but I'm looking for alternatives and sideboard
options. Any ideas?

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I'm not an expert, but I play one on Usenet.