If I attack with kalonian hydra for first time so 8/8 and am blocked by ætherling and he pumps his toughness to 8 but then exiles does the trample damage take place since damage has not been dealt yet or does the 8 toughness block the damage?
If the blocking creature is not there, it cannot absorb any damage before being trampled over. It either hangs around and takes the 8 (better to make it bigger than what it needs to be like 9 or something) or its no there to have damage assigned to it.
{Kalonian Hydra}
{Ætherling}
RESOLVED
Here's the rule if you're curious
702.19c (http://imtgapp.com/forum/index.php?action=imtg;area=rule;number=702.19c): If an attacking creature with trample is blocked, but there are no creatures blocking it when damage is assigned, all its damage is assigned to the player or planeswalker it's attacking.
Thank you guys for the quick replies...this scenario happened to me bout two weeks ago at fnm and it just clicked this morning that I shoulda won :/