Both of these are only able to be activated upon attack declaration, so they are probably the most immediate options
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Lower Text - Promo Info booster Battle of Omega [BT-05] CLOSECLOSE BT5-073 C Digimon Lv.3 Pillomon Color Purple Form Rookie Attribute Vaccine Type Mammal DP 4000 Cost 3 Digivolve Cost 1 0 from Lv.2 Digivolve Cost 2 - Upper Text - Lower Text - Promo Info booster Battle of Omega [BT-05] CLOSECLOSE BT5-074 C Digimon Lv.4 Troopmon Color Purple Form Champion Attribute Data Type Undead DP 3000 Cost 4 Digivolve Cost 1 2 from Lv.3 Digivolve Cost 2 - Upper Text [On Deletion] You may play 1 [Troopmon] from your hand without paying its memory cost
Avoiding expensive permanents is also much harder given that multiplayer tends to incentivize permanent-centric play, and that the ability to generate and use large sums of mana is often important
It took a couple of MTG sets to be used effectively, and 20 years later lots of sets regularly use this feature like Throne of Eldraine , Streets of New Capenna , Shadowmoor , Modern Horizons 3 , as well as many Ravnica sets that came after
