Instead of waiting to hit eight or more mana, you turn a spare creature into your best threat right now
That's because we're used to the idea that this is a reasonable price for a creature this size
Artifact Artifact (CTRL to add secondary) Counters Fight Rigging Hideaway 5 (When this enchantment enters, look at the top five cards of your library, exile one face down, then put the rest on the bottom in a random order.) At the beginning of combat on your turn, put a +1/+1 counter on target creature you control
Thoughtseize is preferable to Duress since you can bring it in against white-based creature matchups in an attempt to get rid of their Stony Silence, but Ive used Duress before without too much regret
Non-serialized versions of Edgar Markov are mechanically identical to serialized variants
If Puresteel requires upwards of 10 equipment, then Id say Sram requires a few more