If this card is a 4/4 or bigger, players wont kill it or else they risk giving you 4+ lands
Example: Undead Augur is a great card craw creature, but, before you use it, one of your Zombies needs to die
With Abyss Proxy Shop, you can play with The Monarch Token and every legendary Commander staple you need all without spending a fortune
It also keeps your opponent guessing as to your plans, or allows you to shift (pun intended) your plans on the fly to deal with your opponents current position
If Crystalline Resonance copies a permanent that's copying something else, it will become whatever the target is copying
for instance, Ghalta, Primal Hungers mana value is twelve, but youre often able to cast it for considerably less, and with Ghalta on the battlefield, Excalibur will cost zero mana