Others, like any monsters from the extra deck, either require the player to have a card like polymerization in their hand or specific monsters to use together
The only downside to this move is that it requires three energy for it to be used, meaning that players will need to take the time to build up Electrode's power first
(If this card is your chosen companion, you may put it into your hand from outside the game for 3 as a sorcery.) Abilities you activate that arent mana abilities cost 2 less to activate
Proliferate and card draw gives you the resources to play a longer game while you steadily build your board to the critical mass of power you need to turn a Herald of Secret Streams or Abzan Falconer into an immediate win
Also known as The Sun God Dragon and the Immortal Phoenix
That being said, early adopters didn't necessarily need to buy heavily into the set given the overwhelming number of reprints if they played casually, but the option was there if they wanted to update their inventory