Supercell started a draft challenge that gives players the opportunity to collect up to 100 Heal Cards, which is a big game changer in "Clash Royale."

Developed by Supercell, "Clash Royale" is a free, premium mobile strategy video game that mashed together the features of a collectible card game, tower defense, and multiplayer online battles.

A year after its launch in March 2016, the Heal Card Draft Challenge for the game went live on April 28. This event will last until the end of the month, according to the official blog site of "Clash Royale."

The Heal Card can revitalize any character in battle as long as they are within a three-bloc radius. The spell from the Heal Card lasts for three seconds, and it only needs three elixirs to run.

Meanwhile, the "Clash Royale" blog site also provided the important guidelines that players who want to participate in the challenge should know.

Participants play the first time for free, and drafting will be done during each battle. In the draft, players will choose one of two cards, and the other one will be given to the opponent. In addition, either of the players will have the option to play with or against a Heal Spell.

There are also one-time rewards as the participant progresses through the challenge, where the first reward will be given after four wins. These one-time rewards will be a surprise to the participant. Players can net gold, Heal cards, or a Giant Chest.

For participants to join again, they will have to pay 100 gems. However, participants can earn as much as 100 Heal Cards after winning 12 times in the game.

According to MobiPicker, the Heal Card Draft Challenge actually went live in preparation for the upcoming patch for "Clash Royale" that will be launched on May 1.

The "Clash Royale" Heal Card Draft Challenge is live now until Sunday, April 30.