Look at Me, I'm R&D

As this creature enters and whenever it attacks, stack two dice on top of it. (All dice must be stacked vertically, one on top of another.) This creature gets +1/+1 for each die in its stack. This creature attacks each combat if able. When the stack falls, sacrifice this creature.

When this creature enters, target opponent discards a card.

Enchant creature As this Aura enters, choose a word. Whisper the chosen word: Tap enchanted creature.

Open a sealed Magic booster pack, reveal the cards, and put one of them into your hand. (Remove that card from your deck before beginning a new game.)

(T: Add R.)

Menace (This creature can't be blocked except by two or more creatures.) Other creatures you control wearing hats in their art have menace.

Say "Goblin S.W.A.T. Team": Put a +1/+1 counter on this creature unless an opponent swats the table within five seconds. Activate only once each turn.

(T: Add W.)