Pointed Discussion

Yeah! I devour all my wimpy creatures to make my viashino into a godzilla sized beast . . . then watch in disappointment as it gets killed by removal.

All the devour creatures suffer from this sad fate. At least you can give this one trample easily.

Thats what Madrush Cyclops is for

This worked really well in my poorly built haste/burn deck. First turn, I played a haste 1/1 creature and attacked. Second turn, I played quest for pure flame and another 1/1 creature (attacked). Third turn, I played lightning bolt and another 1/1 creature (attacked as well). Luckily, my opponent didn't want to block with his mana ramp creatures. So I had all three creatures to sacrifice to get an 8/8 on turn 4 that can deal double damage because of quest for pure flame.
Devour 1 doesn't make any sense to me though (2 seems alright if you have a bunch of 1/1s).

Although optional trample is nice, the only real playable viashino and/or critter with devour is obviously Thunder-Thrash Elder because of Devour 3.

I find it funny that the devour ability never mentions that is has to be your creatures sacrificed.

@Dannyman658

Maybe because Wizards assume that you would know that you can only ever Sacrifice permanents you control.