Just pick a legend you enjoy and play.
Skullbriar, the Walking Grave Skullbriar, the Walking Grave has a fascinating ability to go with its saboteur growth
Other versions of this effect mostly exist for the disruption in manabase, knocking players off colours or key nonbasic lands like Gaeas CradleGaeas Cradle or Urborg, Tomb of YawgmothUrborg, Tomb of Yawgmoth, but simply by putting a stun counter on the land it also throws your opponent down a mana for their next turn, which really is significant
Especially good in starting hands that have a 2 CMC mana rock as well, allowing you to play the rock on turn 1
But, regardless of color, you do have options
0-cost cards One thing that wont be included in the list are 0-cost cards, like Black Lotus, Lotus Petal, or Ornithopter