Even though most of these are (surprisingly) not assassins themselves, they synergise so well with the cards from the last section that Id consider them essential support cards
Lets dig in and find out
The singularity foil effect was crafted specifically for this set, and it's something that needs to be seen to be believed
However, removing a single thing while not having complete control over what you remove is probably still going to be situational
After all, six-drops in this format have to compare to cards like Chandra, Flamecaller and Sorin, Grim Nemesis
If you want to keep Geist of Saint Traft around a little longer, equip it with a cheap enchantment to give it some type of protection, like Angelic Gift to give it flying or Aether Tunnel to make it unblockable, so you can keep swinging for an impressive six damage each turn