The end step triggered ability won't trigger, and the cards won't be put into their owner's graveyard
Late Game: You hard cast it for 5 mana, ideally paying both double Red and double Green, to get a 4/4 body, remove a threat, and tutor a powerful utility land
Creatures like Beetleback Chief and Grave Titan will trigger the Marauder a bunch of times
Starting off by milling yourself and reanimating an Elf (or, notably, an Elf-supporting Tyvar planeswalker card), the card immediately provides the board presence that Elves live and die on
This alone would make Maelstrom Wanderer an incredible creature, but it gives your whole side haste too
Your deck must be at least 60 cards