In a 12 life game the following cards are able to 1hko without the need of timber.
Kinjo yu mei Shizawa (when faced with soa or 8 damage cards) lost hog cr lao cr General cr Raven Dacote (everybody forgets him) Kolos
With the use of timber these cards can 1hko:
Avola Ryuichi Zinfrid Sung tzu Tsubame Dugan Ed 12 No nam Python
I probably missed a few but that should be pretty close to the complete list.