The universal dilemma of the Infiltrator was that few decks that played it wanted to tap out to get him there, but sticking him on the board was so devastating that most opponents would consider themselves fortunate to spend that window of opportunity making him go away as trying to race him with a traditional three- or four-drop was pure folly and playing your own blocker, including your own Shadowmage or something a little bulkier risked a removal spell that would lead into a downward spiral of card disadvantage
If a Dragon you control enters the battlefield attacking, it won't cause The Ur-Dragon's last ability to trigger
While egregious play patterns was the primary reason for the bans, the card was also incredibly hard to find, and at one point during its time in Standard, was regarded as the card with the lowest supply, relative to the rest of the formats card pool
In the world of green midrange or ramp decks, landing a Harmonize often means sustaining the pressure and avoiding running out of gas
Players can always just pay the requested mana, or, for each 1 in that cost, they can tap an untapped artifact or creature they control rather than paying the mana
Feed the Swarm gives us enchantment hate in black, and if your opponent isnt using enchantments, you also have creature removal
