There are at least X counters on artifacts, creatures and/or enchantments you control, where X is 1 plus the number of times you've cast
Sin from the command zone this game.
Mana Needed
({5} magic symbol) ({G} magic symbol) ({G} magic symbol) ({U} magic symbol) plus commander tax if applicable available.
Steps
Cast
Sin either from your hand or command zone by paying ({5} magic symbol) ({G} magic symbol) ({U} magic symbol) plus commander tax if applicable.
As
Sin enters, remove all counters from all artifacts, enchantments and creatures you control, putting twice that many +1/+1 counters on
Sin.
Activate
Selvala by paying ({G} magic symbol) and tapping it, adding at least ({G} magic symbol) ({G} magic symbol) ({U} magic symbol) plus an additional ({X} magic symbol) equal to
Sin's power minus 3.
When
Sin enters,
Intruder Alarm triggers, untapping all creatures.
Activate
Ashnod's Altar by sacrificing
Sin, adding ({C} magic symbol) ({C} magic symbol) .