It adds so much texture and richness to combat, especially in Limited
His favorite card of the month is Syndic of Tithes
If this was a larger expansion, I'd relegate these two cards at the end
A-Tier: I Have Slight Doubts, But Likely Eventually Biorhythm ($6) Golos, Tireless Pilgrim ($2) Iona, Shield of Emeria ($4) Sylvan Primordial ($2) Flash ($1.50) These five cards are powerful and potentially really annoying, but theres a lot to be said for each of these being totally fine
or Sword of the Animist on the battlefield early
There's a detailed forum post here, but the essentials are as follows: if a player would open a Rare or Mythic Rare card that they already have four of, the system will automatically replace it with a different card of the same rarity from that set