MODERN

Tron - watch for sweepers, umbras are useful. you don't auto lose to T3 Karn, but oblivion stone is rough, so don't mulligan everything without ethereal armor/coronet type clock. If you're going down to 4/5 cards you better have disruption and a creature.

UWr - you blank their removal, beware of snapcaster/restoration angel, and swing on to victory. On your slow draws they may be able to chain cryptics and win, but that's about it. If they run sweepers, keep your umbras.

Affinity - Stoney Silence, spider umbra and spirit mantle.

Scapeshift - There's really no good ways to interact with them; a non nature's claim (the 4 life you give away hurts) enchantment removal on prismatic omen builds and hope you can dismember their spellskite instead of pathing it. Your own Spellskite might make them wait an extra turn or two depending how much life you've lost. You really need 4 toughness by t2, and sometimes you've just gotta get big with Spiritdancer.

Soul Sister - this one is good for laughs. watch out for celestial flare, so split your auras

Twin - Fairly annoying. exarch's have huge butts, so sometimes you don't get to swing early. Spirit mantle can pull double duty, suppression field also helps. You can't be too slow or they start coming at you with mites.

Pod - In general, Suppression Field does some work and stoney silence can stall a bit. Against Melira rip also stalls and watch out for orzhov pontiff/qasali pridemage. Don't run into kikipod much, I feel it's easier.

Living end - they will cascade early and often. sandbag a creature and some auras. Retether is okay here, but I don't like the card anywhere else, i lied maybe against Tron.

Burn - leyline + more lifegain and go to town

UR storm - remove electromancer/ascension. If you can't, get aggressive starts and have them attempt to go off prematurely.

Infect - you need early removal or spellskite, they are way faster.

Merfolk - they can get pretty aggressive, spreading seas is very effective.

Zoo - very aggressive, so just stall and lifegain first-strike your way to a win.

Fae - this can be troublesome. They have discard, relevant counters against us, while putting a reasonable clock back on us, and can have sac effects. Leyline up and start trampling over tokens.

Twin - In, 3 Nature's Claim, 3 Suppression Field, 2 Gaddock Teeg, Out, 3 Spirit Mantle, 1 Unflinching Courage, 2 Kor Spiritdancer, 1 Spider Umbra.

Pod - In, 2 Stony Silence, 2 Nature's Claim, 1 Rest in Peace, Out, 2 Spirit Mantle, 1 Spirit Link, 2 Spider Umbra

Affinity - In, 2 Stony Silence, 2 Suppression Field, 3 Nature's Claim, Out, 3 Path to Exile, 3 Spirit Mantle, 1 Unflinching Couragge

Scapeshift - In, 2 Gaddock Teeg, 2 Nature's Claim, Out, 2 Kor Spiritdancer, 2 Spirit Mantle

GBx - In, 3 Rest in Peace, Out, 2 Spirit Mantle, 1 Unflinching Courage

http://magic.tcgplayer.com/db/deck.asp?deck_id=1198557

LEGACY

http://www.legacy-france.org/index.php?showtopic=7996&hl=+hexproof%20+auras

http://www.magic-ville.com/fr/decks/showdeck.php?263450

http://www.magic-ville.com/fr/decks/showdeck.php?349307