tarkir: dragonstorm booster box MTG: Traditional Foils Magic: The Gathering - Tarkir:

Card Text 2 [Link DP] DP+2000 [Link Condition] Link [TS] trait: Cost 2 (Plug this card from the hand or battle area sideways into the specified Digimon in the battle area.) [Link Effect] Collision Piercing Card Q&A Q6471 May

And how would you expand this list further

Fortunately, when playing Commander, you can include some of the cheaper dragon cards to get this working

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If that creature is a legal target but the creature you don't control isn't, your creature will still get +1/+2

Ezuri states that whenever a creature with power two or less enters the battlefield under its owner's control, that player gets an experience counter