Whenever Borrelsword Dragon attacks a monster, it has an effect that allows it to gain half the attack of that monster, and cause that monster to lose half of its own attack
Up to three creatures with MV 3 or less has been done at this mana cost, but putting a +1/+1 counter on each of them is pretty huge all said
Removal spells are always something you want to be looking for when opening your Kaladesh packs
Cards like Triple Tactics Thrust offer max rarity for competitive play
Much like Selesnya Adventures, its largely immune to Oko, Thief of Crowns because most of its creatures are cheap and turning them into 3/3s would be an upgrade
Even Buried Ruin feels a little slow here, so thats taking us to five cards I wouldnt play, with a potential sixth in Command Beacon, if Im honest