Although banishing 10 cards from your deck sounds like a lot, in most decks, it really wont hinder your strategy
For this format if your deck cannot run shifter, the 4 highest impact hts would be nib, droll, imperm, and then veiler
Its especially useful among Mox gems because counterspell cards tend to use blue manaand using a counterspell card can save you from taking a lot of spell damage from your opponent
Activate only as a sorcery and only if you've cast an instant or sorcery spell this turn
(This Digimon checks 1 additional security card.) BT1-069 C Digimon Lv.4 Ogremon BT1-072 U Digimon Lv.4 Woodmon Color Green Cost 5 DP 6000 Digivolve Cost 1 Green 2 from Lv.3 Form Champion Attribute Virus Type Vegetation Card Text 1 [Effect] Blocker (When an opponent's Digimon attacks, you may suspend this Digimon to force the opponent to attack it instead.) [When Attacking] Lose 2 memory
A few more examples include: Granite GripGranite Grip to give our commander twice the boost from our lands, Downhill ChargeDownhill Charge to give our commander an instant-speed boost, and OverblazeOverblaze to double the damage our commander will deal no matter their power