Ruhan of the Fomori is perhaps the most straight-forward of these, rushing headlong into battle each turn, but never sure against whom
Thassas Oracle Thassa's Oracle, or Thoracle, is one of the main win conditions in cEDH, and it saw heavy play in Pioneer before the banning of Inverter of Truth
Nyx-Fleece Ram gives us an unconditional 1 life per turn, with Courser of Kruphix doing so conditionally
Orphan generates a ton of value every turn its in play, and you dont need to do anything special to set this up just play a typical game of Magic: The Gathering
I love cards like this, mainly because theyre fun, but look at this as a wildcard land in your deck that has you pay three mana to put it into play (which effectively ramps in mono-blue!) and can be a second copy of your best lands or someone elses
All seeds share a common bond, calling to each other across infinity