Against any tier deck (and almost any other deck to boot), your Sphinx will eat removal immediately, being your only creature w/o shroud generally. That being said, the fact that it has a 3/5 body is nearly entirely irrelevent.
You'd be better off to run a 1-of Mind Spring if you are dead set on running 7 draw spells.
I've been thinking of running this as my counter suite:
Flashfreeze is still pretty relevant, hitting all but 2 of the tier 1 decks and a sizable chunk of the rest. With the latter list, I've many times wished I had just had a Double Negative...which makes me want to run Cancel Its bad, I know...but what counterspell isn't in standard right now?
1st why don't we run ponder? i myself don't either so i have no opinion but i had considered it because what else do we really do turn one?
Play tapped lands?
2nd are people seriously running traumatic visions? perhaps theres something im missing but i don't see the use? please elaborate if you will
Mana fixing cycler early, hard counter later?
4th mysteries of the deep is pretty bad.. thers only 2 draw spells left worth playing, divination and treasure hunt. i prefer divination because it has 0 chance of cycling for 2 mana.. which regardless of how balls deep the pros are in that card, isn't worth it without running halimar depths and jaces, and depths isn't worth making all of the blue sources come into play tapped, there would only be a few left depending on how many drowned catacombs are left in your deck from tar pits.(this opinion is stated in context with THIS deck, RWU control puts TH to better use IMO)
I played a game where a turn 3 Treasure Hunt drew me 6 lands and completely turned the game around. I kept with 2 lands a treasure hunt and 4 other spells, hoping to draw into more but hadn't by turn 3. TH drew me 7 cards and ended up being a game changing play. For 2 mana, that's pretty good.
Against any tier deck (and almost any other deck to boot), your Sphinx will eat removal immediately, being your only creature w/o shroud generally. That being said, the fact that it has a 3/5 body is nearly entirely irrelevent.
You'd be better off to run a 1-of Mind Spring if you are dead set on running 7 draw spells.
I've been thinking of running this as my counter suite:
2-3x Flashfreeze
2x Double Negative
2x Negate
1x Essence Scatter
as opposed to:
3x Negate
3x Essence Scatter
2x Double Negative
Flashfreeze is still pretty relevant, hitting all but 2 of the tier 1 decks and a sizable chunk of the rest. With the latter list, I've many times wished I had just had a Double Negative...which makes me want to run Cancel
Either way, I think 8 is a good number.
Play tapped lands?
Mana fixing cycler early, hard counter later?
I played a game where a turn 3 Treasure Hunt drew me 6 lands and completely turned the game around. I kept with 2 lands a treasure hunt and 4 other spells, hoping to draw into more but hadn't by turn 3. TH drew me 7 cards and ended up being a game changing play. For 2 mana, that's pretty good.