Training Grounds - [Halo Foil, Showcase] March of the Machine: The Aftermath (MAT)Activated abilities of creatures you control cost up to {2} less to activate. This effect can't reduce the mana in that cost to less than one mana.

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sluicing ancient seawater

if you control seven or more Plains

create a 6/6 black Wurm creature token with trample

(Put a +1/+1 counter on each of up to six other target creatures

where X is the number of Rats you control

The aven claim it feeds on thunder and rainbows

(Whenever this creature becomes the target of a spell or ability an opponent controls

you may have target player discard a card

1 foil etched Display Commander

or being stabbed in the back