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When a creature enters the battlefield it will suffer from summoning sickness, meaning that it can't attack or use an ability that tap the creature

Flawless Maneuver, Heroic Intervention, Teferi's Protection etc

Each of them can produce huge amounts of mana

X card, you can use the regular Dusknoir card from the Supreme Victors, Diamond and Pearl, and one of the two Dusknoirs from the Stormfront set, you can choose which one you want to use yourself

I found it so because I was playing Dimir Rogues, a deck that relies on evasive creatures with flying that had a somewhat hard time beating other aggressive decks

All 4 came from the same Trainer Tool Kit in late 2020