If I target my opponents Reality Smasher with say a path to exile and as a result to not wanting my spell to get countered discard a Loxodon Smiter or wilt-leaf liege will their abilities trigger and they be allowed to be placed on the battlefield?
Those abilities will not trigger, simply because they aren't triggered abilities. But the replacement effects created by their static abilities will apply, so you get to drop them to the battlefield when dicarding them to satisfy the Smasher's trigger.
Former Rules Advisor
"Everything's better with pirates." - Lodge
(The Gamers: Dorkness Rising)
"Any sufficiently analyzed magic is indistinguishable from science."
(Girl Genius - Fairy Tale Theater Break - Cinderella, end of volume 8)