Moonlit Basilysk

Description
Sentinel: Spell cast. Whenever your opponent casts a spell, this minion gains +3/+3.

Interactions
The order that spells and Sentinel effects trigger can be confusing. Moonlit Basilysk can survive lethal in some cases, and be destroyed in others:
 * Natural Selection is a single target spell that will kill a minion with the lowest attack stat. If Sentinel was not triggered, it will flip, get the buff, and then get destroyed.
 * Frostburn will trigger Sentinel, buff Basilysk and then apply the damage.
 * Daemonic Lure will deal the damage first before the Sentinel transforms resulting in a 5/5 Moonlit Basilysk.
 * Phoenix Fire will not kill the Sentinel, but instead produce a 5/5 Moonlit Basilysk.
 * Plasma Storm will kill the Sentinel since it is treated as a 2/2 'base'.
 * Lasting Judgement transforms and then kills the Sentinel.
 * Ritual Banishing doesn't kill any Spell Sentinels. So the Watchful Sentinel will transform into a 5/5 Moonlit Basilysk.
 * If Flawless Reflection is used on an opponent's Moonlit Basilysk it will trigger and buff Moonlit Basilysk of course but transform all surrounding minions into 2/2 Basilysks.

Balance Changes
v. 1.87 - added with the Unearthed Prophecy expansion.