These are fairly different mechanics that share the common theme of making summoning sick creatures do more than blocking by empowering a different permanent
Top late-game performers are Flotsam and Jetsam, along with Moana, Of Mutunui, and Dr
Abomination of Llanowars graveyard theme exemplifies that perfectly
Fumigate Five mana has traditionally been expensive for a sweeper, but being able to gain life from Fumigate is big deal and will push Fumigate to be Standards go-to sweeper
When it's defeated, exile it, then cast it transformed.) When Invasion of Amonkhet enters the battlefield, each player mills three cards, then each opponent discards a card and you draw a card
Scavenge exiles a card from your graveyard to put +1/+1 counters on a creature like a twisted version of undying