Generally speaking, in decks that are three or more colors, you want to play almost all dual lands, along with enough basic lands to support whatever ramp is in your deck (Land Tax, Kodama's Reach, Rampant Growth, et al.)
Tellah, Great SageTellah, Great Sage is a card that needs some amount of build around to be a formidable commander, especially at a mana value of 5
This can lead to lost or ruined cards which defeats the entire purpose of buying a box in the first place
BGS or CGC Pristine labels and PSA 10s command a premium price
12 copies of the card were awarded to some of the tournaments 50 contestants
(Also, in addition to their main effects, every Ashtra Trap Card can be Summoned as a Tuner monster, giving you lots of strategic options!) Between the fiery rage of Ashtraja Susanoo and the cold precision of Ashtraya Mikumari-no-Mikoto, no card is safe from this themes Synchro Monsters