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Describe the Bug:
When a creature targetted by Hunter's Insight deals combat damage to a player, its controller doesn't get to draw any cards.

Which card did behave improperly ?
Hunter's Insight

Which update are you using?(date,name)Which type(Duel,Gauntlet,Sealed Deck)
CIA v2, Duel

What exactly should be the correct behavior/interaction ?
Whenever a creature targetted by Hunter's Insight deals combat damage to a player or planeswalker, its controller draws that many cards.

Are any other cards possibly affected by this bug ?
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Edit1: confirmed by BAgate; Edit2: changed thread title to match new report guidelines

Works for me.

(Still works for me.)

Still doesn't seem to work with trample damage.

seems similiar to the Hunter's Prowess bug [see screenshots.)

On another occasion, Garruk's Companion blocked by a 2/1 and targetted by Hunter's Insight didn't draw any cards. That was like 10 mins ago.

Confirmed as to trample. When trample damage is dealt it appears that you draw cards equal to trample damage + creature's power (same with Hunter's Prowess). I remember seeing something similar before, but I can't remember where.

Only when it's both trample damage and the creature is destroyed at the same time - the engine apparently removes destroyed creatures from play before applying trample damage. The same will happen for anything else triggering on dealing damage to a player, whether it's the creature itself or something attached to it that triggers. sub_4B23C0() is at fault, same as for the trample/lifelink bug.

event trace | Open

EVENT_PHASE_CHANGED
EVENT_COUNT_MANA aff:0/1 Forest
EVENT_PREVENT_DAMAGE aff:0/13 Damage to Balduvian Bears
EVENT_PREVENT_DAMAGE aff:1/9 Damage to Garruk's Companion
EVENT_DAMAGE_PREVENTION aff:1/7 Rules Engine
EVENT_DEAL_DAMAGE aff:0/13 Damage to Balduvian Bears
EVENT_DEAL_DAMAGE aff:1/9 Damage to Garruk's Companion
TRIGGER_DEAL_DAMAGE cause:0/11 Garruk's Companion
EVENT_GRAVEYARD_FROM_PLAY aff:0/13 Damage to Balduvian Bears
EVENT_GRAVEYARD_FROM_PLAY aff:1/9 Damage to Garruk's Companion
TRIGGER_GRAVEYARD_ORDER cause:0/11 Garruk's Companion
TRIGGER_LEAVE_PLAY cause:0/11 Garruk's Companion
EVENT_GRAVEYARD_FROM_PLAY aff:0/12 effect:Hunter's Insight
EVENT_SET_COLOR aff:0/1 Forest
EVENT_CHANGE_TYPE aff:0/1 Forest
EVENT_ABILITIES aff:0/1 Forest
EVENT_SET_COLOR aff:0/7 Rules Engine
EVENT_CHANGE_TYPE aff:0/7 Rules Engine
EVENT_ABILITIES aff:0/7 Rules Engine
EVENT_SET_COLOR aff:1/7 Rules Engine
EVENT_CHANGE_TYPE aff:1/7 Rules Engine
EVENT_ABILITIES aff:1/7 Rules Engine
EVENT_SET_COLOR aff:1/8 Balduvian Bears
EVENT_CHANGE_TYPE aff:1/8 Balduvian Bears
EVENT_ABILITIES aff:1/8 Balduvian Bears
EVENT_COUNT_MANA aff:0/1 Forest
EVENT_TOUGHNESS aff:1/8 Balduvian Bears
EVENT_POWER aff:1/8 Balduvian Bears
EVENT_COUNT_MANA aff:0/1 Forest
TRIGGER_GRAVEYARD_ORDER cause:0/11 Air Elemental
TRIGGER_LEAVE_PLAY cause:1/8 Balduvian Bears
EVENT_SET_COLOR aff:0/1 Forest
EVENT_CHANGE_TYPE aff:0/1 Forest
EVENT_ABILITIES aff:0/1 Forest
EVENT_SET_COLOR aff:0/7 Rules Engine
EVENT_CHANGE_TYPE aff:0/7 Rules Engine
EVENT_ABILITIES aff:0/7 Rules Engine
EVENT_SET_COLOR aff:1/7 Rules Engine
EVENT_CHANGE_TYPE aff:1/7 Rules Engine
EVENT_ABILITIES aff:1/7 Rules Engine
EVENT_COUNT_MANA aff:0/1 Forest
EVENT_COUNT_MANA aff:0/1 Forest
TRIGGER_GRAVEYARD_ORDER cause:0/11 Air Elemental
TRIGGER_GRAVEYARD_FROM_PLAY cause:0/11 Air Elemental
EVENT_COUNT_MANA aff:0/1 Forest
EVENT_COUNT_MANA aff:0/1 Forest
EVENT_PREVENT_DAMAGE aff:1/10 Trample Damage
EVENT_DAMAGE_PREVENTION aff:1/10 Trample Damage
EVENT_DEAL_DAMAGE aff:1/10 Trample Damage
TRIGGER_DEAL_DAMAGE cause:0/11 Air Elemental
EVENT_GRAVEYARD_FROM_PLAY aff:1/10 Trample Damage
TRIGGER_END_COMBAT cause:0/11 Air Elemental
EVENT_SET_COLOR aff:0/1 Forest
EVENT_CHANGE_TYPE aff:0/1 Forest
EVENT_ABILITIES aff:0/1 Forest
EVENT_SET_COLOR aff:0/7 Rules Engine
EVENT_CHANGE_TYPE aff:0/7 Rules Engine
EVENT_ABILITIES aff:0/7 Rules Engine
EVENT_SET_COLOR aff:1/7 Rules Engine
EVENT_CHANGE_TYPE aff:1/7 Rules Engine
EVENT_ABILITIES aff:1/7 Rules Engine
EVENT_COUNT_MANA aff:0/1 Forest
EVENT_COUNT_MANA aff:0/1 Forest
EVENT_PHASE_CHANGED
EVENT_COUNT_MANA aff:0/1 Forest

The Hunter's Prowess bug miscounting damage dealt is unrelated (though Hunter's Prowess also has this one, and Hunter's Insight has that one) and a lot more tractable.

Using a non-attached legacy solves the problem, it's a bit more confusing but oh well...
Hunter's insight fixed in 434f076 (but only the bug about not drawing if a creature with trample dies in combat).
Hunter's Prowess fixed in 0d953b8 (same as above).

Both cards work properly as of CoRM15 mini2.