The +0/+1 bonus to other snakes isnt the worst
Plus, it doesn't remove itself from the game so you can get it back with Regrowth, Yawgmoth's Will, and other graveyard recursion cards (including Gaea's Blessing, further down on this list)
Theres another Duck with a nice Boost -boosting ability that readies those characters
Since Sefris gives us the rare opportunity to reanimate things at instant speed (any time we can get the last venture trigger in), we can even use these hatebombs reactively to blow out our opponents like reanimating Sunblast Angel in response to an attack, or Avacyn, Angel of Hope in response to Wrath of God
Using extra ink to move your characters to Motunui before sacrificing them in a challenge is also a great strategy, since every one of your characters that's banished there will move to your inkwell instead of your discard pile
Landfall has always been way too easy to pull off, and this is a card that rewards you just for playing the game