Due to its rarity, it may be hard to obtain this specific card
Knightmare Unicorn can even be brought out during the opponent's turn thanks to cards like I:P Masquerena
For Effect Text, note the use of colons and semicolons, which indicate activation conditions and costs/requirements, respectively
To hope to win (because nothing is impossible), you must try to quickly outnumber your opponent, with combos like Ohm/Holy, for example, or with some of your trigger effects, or quickly manage cards that can eliminate your characters
The combination of Mystic Tomato and Creature Swap also makes an appearance here, because swapping a tomato for a stronger monster is always useful, especially when you can get a draw on top of everything else
Something to look out for as a jump in serialized prices, perhaps