Many subsequent assassins have been variants on one of these two designs for creature-based removal
But the key value is the Scry ability whenever a creature you control dies
You see We have a lot more options in the Historic card pool, but most notably the main constraint on the old Standard Mono-Blue Aggro deck is now gone
As long as the top card of your library is a Goblin card, this creature has all activated abilities of that card
Considering Dragons have some very powerful, high mana value creatures with powerful abilities and some of the best tribal synergies, this is a powerhouse of an enchantment
As such, you can move Equipment or Auras on your combat for attacking, then when it comes to your opponents combat, you can shift these around again for blocking