Travel back in time to command powerful artifacts and giant robots
The rate isn't bad for what you get, either, and the Great Train Heist will be useful at every stage of a game, whether you're using it for an early mana advantage, as a combat trick (offensively or defensively), or as a source of extra damage to close out a game
When it goes off, it potentially creates an increasing feedback loop that just creates more spells, more cards, and more mana
Since Conspiracy 2 has a huge print run, the prices of these cards are going to take significant hits, which is great news for folks like myself who want to see format staples kept at a reasonable price
0.5/10$0.15 Bellowing Fiend Creature Spirit 3/3 Flying Whenever this creature deals damage to a creature, this creature deals 3 damage to that creature's controller and 3 damage to you
Your opponents have a bit more agency over how big Leela gets, though