Pokmon today chooses not to deliver everything at once, so partial delivery by Pokmon is Possible.
The promise of some extra mana can absolutely make your opponents start pinging each other, making them the very group slug resources you need
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
If a characters strength number is equal to or greater than the opposing characters willpower, they are banished
Flash plus flexible abilities make every combat miserable and turn instant-speed pressure into a legitimate win condition
Their silver border helps denote their legality at a glance, which deters their use in competition against unknowing opponents