Best defensive cards outside of Blue or White?
Some decks rightfully draw aggro, but the question is: How do you answer that aggro and not only survive, but win? The answer to that aggro can sometimes be to outrace your opponents, but other times it's to slow the game down or deter being attacked. Not every color has Propaganda/Ghostly Prison style effects, and some colors like Red have to get particularly creative if they're on the defensive.
What cards have you encountered that have been effective in pillowforting when you don't have access to either White or Blue? I'll start off with a couple of examples that have worked well for me, EDIT: I've added many suggestion from comments, and will continue to do so.
- [[Bloodthirsty Blade]]
- [[Maze of Ith]]
- [[Thaumatic Compass]]
- [[Brash Taunter]]
- [[Phyrexian Obliterator]]
- [[No Mercy]]
- [[Dread]]
- [[Vampire Nighthawk]] / [[Nighthawk Scavenger]]
- Anything that goads, especially at Instant-speed
- Any form of deathtouch
- [[Ophiomancer]]
- [[Elephant Grass]]
- [[Koskun Falls]]
- [[Kazuul, Tyrant of the Cliffs]]
- [[Emberwilde Captain]]
- [[Vigor]]
- [[Fog]] / [[Obscuring Haze]] / [[Moment's Peace]] / all the other Fog variants
- [[Darkness]]
- [[Sudden Spoiling]]
- [[Spore Frog]]
- [[Spike Weaver]]
- [[Sunstone]]
- [[Glacial Crevasses]]
- [[Glacial Chasm]]
- [[Caverns of Despair]]
- [[Silent Arbiter]]
- [[Crawlspace]]
- [[Revenge of Ravens]]
- [[Vengeful Pharaoh]]
- [[Witch-King of Angmar]]
- [[Grave Pact]] / [[Dictate of Erebos]] / [[Butcher of Malakir]]
- [[Dragon Broodmother]]