Attempt to Assassinate Thought

Vigilance, Hexproof, Flying

At the start of each player's turn choose one:
-Players cannot cast non-creature spells this turn
-Players must attack with all creatures this turn
-Players lose 5 life at the beginning of their upkeep
{4}: Place a infection counter on target attacking creature
If this creature would die or leave the battlefield, target creature with an infection counter dies or leaves instead