mtg cards that let you draw Rules Text: Whenever a card, 46 Cards with Scry and Draw?

Instants can be cast at any time, including during other players' turns and while another spell or ability is waiting to resolve

But lets take a look at the measurements, shall we

If you've ever spent ten mana to cast an Ulamog, the Ceaseless Hunger, you can probably imagine how it feels to cast it for free

He's great in tons of places and shells

However, fundamentally, a strategy that relies on combat to settle the game is often avoided in Commander because it is a roundabout method

If its red, you may cast it this turn, which does not allow you to put lands onto the battlefield, because a) you do not cast lands and b), even if you did, lands do not have colors despite producing colored mana