Whenever Saint Traft and Rem Karolus becomes tapped, create a 1/1 red Human creature token if this is the first time this ability has resolved this turn. If it's the second time, create a 1/1 blue Spirit creature token with flying. If it's the third time, create a 4/4 white Angel creature token with flying.
Whenever you cast a spell that has convoke, untap Saint Traft and Rem Karolus.
If it’s the fourth or subsequent time the first ability has resolved in a turn, nothing happens.
The last ability of Saint Traft and Rem Karolus will trigger whether you tapped any creatures to pay for the spell or not, as long as it has convoke.