With how many Rats you'll be making, Rat Colony's power will skyrocket and progressively become a must-answer creature
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You do this until youve got an army of tokens, and then you 1-Hit KO your opponent
With Wrenn and Realmbreaker out, your lands all tap for any color of mana, giving you all the colors of mana you need to cast your spells
For reference, before the tax was added to the Companion mechanic, as long as you upheld the deckbuilding restriction that the Companion requested, you could add your Companion from the Companion zone (your sideboard) to your hand at no cost essentially allowing you to begin the game with a guaranteed extra card in hand
Theyre mostly multicolored legendary creatures with varying combat stats, unique abilities, and they usually revolve around themes from their color pairings