Flamerush Rider [March of the Machine Commander] Gideon cast it for its madness

cast it for its madness cost or put it into your graveyard

Whenever another creature with power 4 or greater enters the battlefield under your control

Field Commander as your Ring-bearer

Inquisitive Student attacks

If X is greater than or equal to the number of cards in your library

Flamerush Rider [March of the Machine Commander] Gideon cast it for its madnessSet: March of the Machine Commander Type: Creature Human Warrior Rarity: Rare Cost: {4}{R} Whenever Flamerush Rider attacks, create a token that's a copy of another target attacking creature and that's tapped and attacking. Exile the token at end of combat. Dash {2}{R}{R} (You may cast this spell for its dash cost. If you do, it gains haste, and it's returned from the battlefield to its owner's hand at the beginning of the next end step.)