The Seventh Doctor card, showing Slyvester McCoy as the Doctor, features a much more complicated ability that has defending players attempting to guess whether the mana value of a card in the attacking players hand is greater than the number of artifacts they control
Ive seen a lot of people take a few hits early on to try to get up to metalcraft, only to find themselves at seven counters and unable to plan an attack that doesnt leave them dead on board to any removal spell, or to die to proliferate
But since Modern Horizons sets started to appear on the MTG release schedule and flood the format with broken cards, those old banning decisions have looked increasingly quaint
Its also not likely for anyone other than a dedicated token deck to have creatures left after this resolves
Giving your creature protection from white and red also helps it to dodge a lot of removal, including staples like Swords to Plowshares or Path to Exile
Sister Hospitaller is a great card