Spider Rider

Deadly - Units and spells with Deadly kill any unit they damage, regardless of health. For example, a 1/1 with Deadly can kill a 5/5 attacker.

Entomb - The ability of a unit with Entomb will activate when it dies. This combines well with effects that sacrifice units as a cost.

Lifesteal - Units and spells with Lifesteal give you health when they deal damage, healing you equal to the damage dealt.

Renown - Does something the first time you play a spell or weapon directly on it.