mtg cards with metalcraft Razorfield Rhino [Mirrodin Besieged] Metalcraft — Galvanic Blast deals 4 damage instead if you control three or more artifacts. Metalcraft in Commander – Why

9 Elvish Refueler Exhaust Without Limits 3 Mana Green Creature Elvish Refueler introduces the first new mechanic for Aetherdrift: Exhaust

You can tap four untapped Advisor creatures you control to make one of your opponents mill twelve cards

These have all held their price points fairly well given their relevance in Standard and Commander--they come into play untapped and are fairly easy to "turn on" so that they can tap for both colors of mana

We aggressively keep turn one Chalice hands against Tron, but still need the effect for Oblivion Stone in many games, so Needle has a lot of tension with our plan in this matchup specifically

Having a solid idea of how you want your deck to perform is key to any build and you should focus on adding cards that support that theme