Find a Crossing Target creature gets +1/+0 until end of turn and cant be blocked this turn
The Magical Places promo for Attack of the Vine is Maleficent, Exultant Spellcaster
There's a few other good ones too
I cant emphasize enough how powerful taking game actions, like drawing cards, by spending zero mana can be so I think Sanguine Spy might be secretly pretty good
Its niche, but there are a number of multicolored ally commanders that like to play this card, like Avatar Aang, as well as more classic ones like General Tazri
This was a problem though for things like MTG Changelings, as they then needed an additional bit of rules text to explain that they could attack, despite having the Wall creature type