Mana Vault One mana for three colourless is an extraordinary rate
I ripped my first pack of cards at 6 years old and pulled a 1977 Topps Tony Dorsett rookie, a huge bonus in that I was a Cowboys fan
Over time that definition broadened to include any creature with any enters the battlefield effects
Most creatures with reach are defensive in nature, like 1/2 or 2/4, so Dhalsims ability to make creatures unblockable based on their power makes sense in a reach deck
Unlike cheaper planeswalkers, six-mana walkers wont typically pull you back from a losing boardstate, instead serving to cement an advantage or eke out a win from a tight game
Mainly they revolve around the elemental crystals with artifact cards for the darkness, earth, fire, water and wind crystals, all of which are now quite rightly legendary artifacts