According to the rule, excess damage is any damage dealt to a permanent beyond the amount that would've destroyed it, so a 2/2 usually dies to 2 damage (or 1 damage with DT), and any extra dealt to it becomes excess, aye?
Then, if I gave Aegar trample and opponent blocks with a 2/2, does it mean I still need to assign all three damage to the 2/2 if I want to draw a card from Aegar's effect?
In your scenario, the blocking creature must be assigned an amount of damage greater than lethal damage (and other conditions must be met) for Aegar's ability to trigger for that creature.
For purposes of Aegar, a permanent was dealt "excess damage" if "one or more sources ... together dealt"—
"an amount of damage to [the] creature greater than lethal damage", or
"an amount of damage to [the] planeswalker greater than that planeswalker's loyalty before the damage was dealt",
as the case may be (C.R. 120.10). The trample ability, however, changes how combat damage is assigned, not how it's dealt (review C.R. 702.19).
In your scenario, the blocking creature must be assigned an amount of damage greater than lethal damage (and other conditions must be met) for Aegar's ability to trigger for that creature.
For purposes of Aegar, a permanent was dealt "excess damage" if "one or more sources ... together dealt"—
"an amount of damage to [the] creature greater than lethal damage", or
"an amount of damage to [the] planeswalker greater than that planeswalker's loyalty before the damage was dealt",
as the case may be (C.R. 120.10). The trample ability, however, changes how combat damage is assigned, not how it's dealt (review C.R. 702.19).
So in able to trigger Aegar, I need to assign all 3 of his damage to the creature, thus no damage to the controller.
According to the rule, excess damage is any damage dealt to a permanent beyond the amount that would've destroyed it, so a 2/2 usually dies to 2 damage (or 1 damage with DT), and any extra dealt to it becomes excess, aye?
Then, if I gave Aegar trample and opponent blocks with a 2/2, does it mean I still need to assign all three damage to the 2/2 if I want to draw a card from Aegar's effect?
Shu Yun, the Silent Tempest WUR Voltron Control
Temmet, Vizier of Naktamun WU Unblockable Mirror Trickery
Ra's al Ghul (Sidar Kondo) and Face-Down Ninjas
Brudiclad, Token Engineer
Vaevictis (VV2) the Dire Lantern
Rona, Disciple of Gix
Tiana the Auror
Hallar
Ulrich the Politician
Zur the Rebel
Scorpion, Locust, Scarab, Egyptian Gods
O-Kagachi, Mathas, Mairsil
"Non-Tribal" Tribal Generals, Eggs
For purposes of Aegar, a permanent was dealt "excess damage" if "one or more sources ... together dealt"—
as the case may be (C.R. 120.10). The trample ability, however, changes how combat damage is assigned, not how it's dealt (review C.R. 702.19).
So in able to trigger Aegar, I need to assign all 3 of his damage to the creature, thus no damage to the controller.
Shu Yun, the Silent Tempest WUR Voltron Control
Temmet, Vizier of Naktamun WU Unblockable Mirror Trickery
Ra's al Ghul (Sidar Kondo) and Face-Down Ninjas
Brudiclad, Token Engineer
Vaevictis (VV2) the Dire Lantern
Rona, Disciple of Gix
Tiana the Auror
Hallar
Ulrich the Politician
Zur the Rebel
Scorpion, Locust, Scarab, Egyptian Gods
O-Kagachi, Mathas, Mairsil
"Non-Tribal" Tribal Generals, Eggs