Sawtooth Loon is looked down by most of the magic
community. If I pay 4
mana I get a creature and 2 cards in return. But this is a good thing in a
1. Yet another Honorable Scout combo.
2. The cards are free, since you don't get any closer to decking
3. Replay Meddling Mage.
4. Get more counter-magic.
I've tried it out in a W/U Magpie-Go deck, and it helped a lot, like this
4 Coastal Tower
4 Thieving Magpie
4 Sawtooth Loon
4 Meddling Mage
4 Benalish Trapper
4 Stormscape Familiar
3 Orim's Chant
2 Healing Salve
4 Sleight of Hand
This deck focuses on early game control, with 24 lands to get ya there. The
trappers, counters, and chanters stop your opponent from doing much. The
salves are there because you can get off to a slow start sometimes.
Mage takes care of red and black (usually). Heres a sideboard:
1 Meteor Crater
3 Voice of All
3 Honorable Scout
3 Story Circle
2 Essence Leak
This adds more protection against the other colors. Again, the loon gets
the cards you need in this deck. The Loon isn't perfect for every U/W deck,
but pretty good for the sideboard.