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Describe the Bug:
High Market when used to sacrifice a creature and gain a life in opponents turn doesn't give the life.It works ok on your turn.

Which card did behave improperly ?
High Market

Which update are you using?(date,name)Which type(Duel,Gauntlet,Sealed Deck)
ML3.0 APRILV2

What exactly should be the correct behavior/interaction ?
High Market when used to sacrifice a creature and gain a life in opponents turn must give 1 life.

Are any other cards possibly affected by this bug ?

Fixed.

Fixed.

Fixed.

When World Queller ability is activated and a creature is chosen, it asks me to sacrifice 2 creatures, one after the other, while the AI doesn't sacrifice any.
I didn't check if the bug happens with other kind of permanents.
I also report that, in previous editions, it crashed if I selected a kind of permanent that I didn't own (eg. if I did choose artifact or planeswalker when I had none, but maybe the AI had, the game usually did crash)

When AI uses Bloodline Keeper, it "cheats", since it can transform it when it has less than 5 vampires on the battlefield (usually 3).

Describe the Bug:
Stormbound geist can block creatures without flying.

Which card did behave improperly ?
Stormbound geist

Which update are you using?(date,name)Which type(Duel,Gauntlet,Sealed Deck)
Sensei of Vanilla Masques, v.2, constructed.

What exactly should be the correct behavior/interaction ?
Stormbound geist cannot block creatures without flying.

Are any other cards possibly affected by this bug ?

No.

Describe the Bug:
Spinebiter does not have infect, and its "super trample" ability doesn't work.

Which card did behave improperly ?
Spinebiter.

Which update are you using?(date,name)Which type(Duel,Gauntlet,Sealed Deck)
Sensei of Vanilla Masques, v.2, constructed.

What exactly should be the correct behavior/interaction ?
Spinebiter should have infect, and should be able to assign damage to the opponent as if it were not blocked.

Are any other cards possibly affected by this bug ?
No.

It also has wrongly an ability 1U to return to hand!

When Teferi's Moat is on the battlefield, opponet's creature of the chosen color may attack me as if T.moat wouldn't be on the battlefield. Never tried the opposite situation.

: Requiem Angel has no flying ability.

Whenever I deal combat damage to a player, Fiend of the Shadows has no effect, while it should exile a card from opponent's hand and allow me to play it.

: Stillmoon Cavalier can be played only using white mana, while it should allow the use of black mana too. Activated abilities are fine. I did use it in a mono-black deck with swamps only and had to put 2 plains on the battlefield to paly it.

The AI cheats while using Protean Hulk: in fact, it has been able to take all creatures with a casting cost of 6 or less from its library and put them onto the battlefield. The total casting cost of those creatures was much over "6"!

When Brion Stoutarm ability is activated, it exiles target creature from the game instead than killing it and it deals no damage to the opponent.