I became cavalier having 406k one day ago, (i haven't R5, only R4-R3 5* and one 6* R1).
You dont need R5 5* or R2 6*, you need maybe save this resources to upgrade some good champ who will help you, is better have more R4 5* and one R1 6*, than have one R2 6*(except if you have good sinergies in high rank) and maybe one good champ in R2-3 5*, domino is strong, corvus too but in that rank are fine. You could share your champs and some will help you if you want.
Domino is my favorite champ by far at 4/55. She can do nearly anything I need. Every once in a while I will just stack up synergies around her (without any high level partners cause most are 3*) and there is rarely a fight she does not shine. For instance, Daredevil will cook ur summoner booty if you use domino against him because your first medium and light attacks are projectiles.
Yes it is worth an extra t5bc. Remember, a year from now she will be able to be at least r3, miles better than a 5/65
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You dont need R5 5* or R2 6*, you need maybe save this resources to upgrade some good champ who will help you, is better have more R4 5* and one R1 6*, than have one R2 6*(except if you have good sinergies in high rank) and maybe one good champ in R2-3 5*, domino is strong, corvus too but in that rank are fine.
You could share your champs and some will help you if you want.
Sorry for my english.
Yes it is worth an extra t5bc. Remember, a year from now she will be able to be at least r3, miles better than a 5/65