[BUG] - Gargantuan Gorilla
Step 1 - Cast Gargantuan Gorilla
Step 2 - During your next upkeep, his Triggered ability will trigger (sacrifice a Forest).
Step 3 - Activate his activated ability (deal damage to target creature), and choose himself as the target.
What I observed: He was able to target himself, thus killing himself. Thus, if you don't sacrifice a forest via his upkeep trigger, you can't sacrifice him and don't take 7 damage.
What I expected to happen: You shouldn't be able to target himself with his activated ability, since it expressly says "another target creature".
[BUG] - Riders of Gavony and Clone
Step 1: Opponent casts Rides of Gavony and names "human" as it came into play.
Step 2: I played Clone, copying Rides of Gavony and also named "human" as it came into play.
Step 3: Attacked with a Human creature.
Step 4: He blocked with Human Creature
What should have happend: He shouldn't have been able to block with a Human creature.