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With Sensei, Golden Tail, can you put a training counter on a samurai, or more than one on a creature? I'm not sure if the Bushido 1 ability stacks or not.

Bushido stacks. If a creature has bushido 1 twice. It acts as bushido 2 (but each triggers differently so you'd have to stifle both triggers)



Yes. The enchantment will "fall off" and be put into the graveyard via state based effects. But it's still put there 'from play' and will return to your hand. Now, if you play it targetting your creature and something happens to your creature before it resolves (like say the creature gets pro-enchantments, pro-that color or dies) then it 'fizzles' or is countered by the game rules, and doesn't return to your hand.

Does Angel's Grace stop a hellbent Demonfire?

Yes. Angel's Grace doesn't prevent the damage. You can't lose the game anyway. And the effect you're probably questioning is a replacement effect. Not a damage prevention shield. So a hellbent demonfire's damage can't be prevented. Yay! too bad it's replaced by Angel's Grace to put you at 1 if it would kill you.
Note: Basically, 99% of things in Magic that say "If so and so would" are replacement effects. The wording on Angel's Grace says "Until end of turn, damage that would reduce your life total to less than 1 reduces it to 1 instead."
Part in bold is the key phrase there. 3nodding

The rules text on Fertile Ground says this
"Whenever enchanted land is tapped for mana, it produces an additional one mana of any color"
I think that should answer your question domokun

And if it doesnt highlight this line for your answer xp why yes. yes it does add another mana of any color

Yes. Double Strike gives two instances of Combat Damage. The ability on brood sliver will trigger each time. Producing two tokens per sliver that deals combat damage.

Never heard someone saying a tournament was broken. I always hear about individual cards being broken and they've even explained it on wizards.com.
The word broken came around Urza's Saga testing and development.
Broken = A card that's so stupid good it probably shouldnt have been printed in the first place because it causes a lot of problems, causes a metagame shift by itself and shakes up a format. The last pair of 'broken' cards you'll probably recognize were the evil duo of Arcbound Ravager and Skullclamp. Before that it was Mr. Teeth (Psychatog) and Wild Mongrel. The first "broken" deck was a deck centered during the Combo winter. A single land called Tolarian Academy, combined with other stupid good cards of the time (Mind Over Matter, Time Spiral, Windfall, Stroke of Genius) to form a first-third win almost 100% of the time. So much so that a great number of cards were banned in standard. The only time we've come close to the Academy bannings was the last time they nuked standard by killing the five artifact lands, DoV and Ravager. Good enough explination and examples?