Security Effect [All Turns] [Once Per Turn] When this Digimon would leave the battle area other than by your effect, by deleting 1 of your other Digimon with the [D-Brigade] trait, prevent it from leaving play.
In simple terms, it is a Morphing Jar #2 in Spell form, but it can be much more than that since each player gets to specifically choose which monsters to summon
However, black mana received new importance in Magic's Vintage format with the release of Tales of Middle-earth and perhaps the most disruptive card Vintage has seen in years: Orcish Bowmasters
If you decide the archetype you want to play (aggro, midrange, control) I'll try to come up with cards to help support it
Fling something every turn and gain life
However, Eutropia turns garbage auras into tempo swings and critical weapons that your opponents will not see coming