'Ceta Sanctuary' is a blue enchantment for (2U) which allows you to draw 2
cards and discard 1 card during your upkeep if you have a red AND a green
permanent in play!  If you only have a red or only have a green permanent in
play, you instead draw 1 card, and still discard 1!

This deck makes the discarded card effective, as it helps achieve Threshold
for the 'Krosan Beast's!  'Fires of Yavimaya' is key to this strategy, as it
is BOTH red AND green, and it makes your incoming 'Krosan Beast's, 'Shivan
Wurm's, and 'Kavu Titan's have Haste!  Shivan Wurm also returns a 'Mystic
Snake' or a 'Flametongue Kavu', which i have included 4 each of, to your
hand to reuse!

The 'Hull Breach' are mainly for the sure-to-be-rampant "Squirrel Prison"
decks, which contain 'Opposition'!  Also for a pesky 'Pernicious Deed'!  The
'Birds of Paradise' are easy targets for your 'Shivan Wurm's as well!  And
the 'Fact or Fiction's help you 'Ceta Sanctuaries' in achieving Threshold
immensely!
Here's the decklist:

4 Ceta Sanctuary
4 Birds of Paradise
4 Flametongue Kavu
3 Krosan Beast
4 Fires of Yavimaya
4 Mystic Snake
4 Fact or Fiction
3 Hull Breach
4 Syncopate
2 Shivan Wurm
2 Karplusan Forest
3 Shivan Oasis
3 Yavimaya Coast
3 Shivan Reef
5 Island
4 Mountain
4 Forest