bob ross cards mtg Magic The Gathering, Secret Lair: Happy Little Gathering – Card Monster Games Forest (#108)

You get amazing value when you flash this back, and the initial spell is pasasble

it perpetually gains "you may spend mana as though it were mana of any color to cast this spell." You might also be interested in these products

A buddy of mine played it against our pod late in a game that had reached a precarious balance, and the tables reaction was some variation of It does WHAT?!

Walking Ballistas controller removing its last +1/+1 counter to deal damage

There have been other impactful ones since this Kaladesh (2016) card, but this was a key card in Standard for its whole stay and has also seen play in both Modern and Pioneer, as well as Explorer

Four colorless, one black and one green, and six exiled cards from your graveyard lets this multi-headed monster escape back onto the battlefield if its killed, this time with 12 1/1 counters