Sam, Pediatrician of Pain

Lifelink
{t}{x}{g/w}. Create {x} 1/1 Patient creature tokens. This effect happens only once each turn.

{g/w}, sacrifice {x} Patient creature tokens and add a +2/+2 counter to one or more creatures you control. Those creatures gain lifelink and become a Doctor among their other types.

"It's an order not a suggestion"