Shadowfax, Lord of Horses Ive got all the time in the world for haste enablers
Not only does it produce mana, but the activated ability gives you an outlet for it that even forces creatures through countermagic
It can also be a way to save a 3/3 Ooze from Bolt or a Curator from an Unholy Heat that just needs a creature to eat

(This Digimon checks 1 additional security card.) BT2-065 SR Digimon Lv.6 WarGreymon Color Black Cost 12 DP 11000 Digivolve Cost 1 Black 3 from Lv.5 Form Mega Attribute Vaccine Type Dragonkin Card Text 1 [Effect] Blocker (When an opponent's Digimon attacks, you may suspend this Digimon to force the opponent to attack it instead.) Reboot (Unsuspend this Digimon during your opponent's unsuspend phase.) BT2-065 SR Digimon Lv.6 Alternative Art WarGreymon Color Black Cost 12 DP 11000 Digivolve Cost 1 Black 3 from Lv.5 Form Mega Attribute Vaccine Type Dragonkin Card Text 1 [Effect] Blocker (When an opponent's Digimon attacks, you may suspend this Digimon to force the opponent to attack it instead.) Reboot (Unsuspend this Digimon during your opponent's unsuspend phase.) BT2-066 SR Digimon Lv.6 Machinedramon Color Black Cost 12 DP 11000 Digivolve Cost 1 Black 4 from Lv.5 Form Mega Attribute Virus Type Machine Card Text 1 [Effect] Blocker (When an opponent's Digimon attacks, you may suspend this Digimon to force the opponent to attack it instead.) [On Play] Trigger De-Digivolve 2 on 2 of your opponent's Digimon

To help with that, it's good to identify some of the best Limited cards ahead of time, so that the drafting or deck-building process is a little easier
This resulted in 1st Edition runs sometimes launching simultaneously with, or even after, their Unlimited counterparts, effectively making them pointless