Figured this might be a good topic
GTA online - Anniversary gift (they do this every year) Log in before Oct 2nd and you get 1,000,000 added to your account.
MTG Arena - Launch event - Make one deck in standard, using any standard cards, and play it in the event. Get 12 wins without losing twice and the reward is one copy of EVERY card in standard format.
(event is active first week in October, practice run available this weekend)